GPT-5 vs Muse Spark 1.3
Full profiles: GPT-5 (OpenAI) and Muse Spark 1.3 (Meta): every benchmark, price and rank.
Updated · Data from 9 sources
As of 2 Nov 2026, GPT-5 and Muse Spark 1.3 are neck and neck on quality (58.2 vs 61.9 on the BenchLeader Index, inside the ±6.4 margin), and Muse Spark 1.3 is 1.7× cheaper at $2.00 vs $3.44 per 1M tokens blended. Choose GPT-5 for long context (70 vs 66) and maths (66 vs 63); choose Muse Spark 1.3 for reasoning (61 vs 48), coding (61 vs 51), and multimodal (66 vs 57), where it also streams ~1.5× faster.
Key facts (as of 2 Nov 2026)
- GPT-5 scores 58.2 on the BenchLeader Index and Muse Spark 1.3 scores 61.9 (BenchLeader, 2 Nov 2026).
- GPT-5 costs $3.44 per 1M tokens blended (list price, 2 Nov 2026).
- Muse Spark 1.3 costs $2.00 per 1M tokens blended (list price, 2 Nov 2026).
- Muse Spark 1.3 streams ~1.5× faster than GPT-5 (Artificial Analysis, 7-day median, 2 Nov 2026).
- Of the 8 benchmarks both models have, Muse Spark 1.3 leads 8 (BenchLeader, 2 Nov 2026).
- On Arena WebDev, GPT-5 is rated 1417 and Muse Spark 1.3 1656 (LMArena, as published by 2 Nov 2026).
GPT-5 benchmarks 
Muse Spark 1.3 benchmarks Which to pick for…
The pick's numbers come first. Category scores on the BenchLeader scale (50 is the average model, 15 points one standard deviation). High confidence means a lead of half a standard deviation or more; under one point is called either.
| Use case | Pick | Why | Confidence |
|---|---|---|---|
| Coding | Muse Spark 1.3 | 61 vs 51 category score; Arena WebDev 1656 vs 1417 | High |
| Agents & tool use | Muse Spark 1.3 | 66 vs 57 category score | High |
| Maths | GPT-5 | 66 vs 63 category score | Medium |
| Reasoning | Muse Spark 1.3 | 61 vs 48 category score; GPQA Diamond (AA) 93.5% vs 84.2% | High |
| Long documents | GPT-5 | 70 vs 66 category score; AA-LCR v1.1 76.0% vs 83.0% | Medium |
| Images and other media | Muse Spark 1.3 | 66 vs 57 category score | High |
| Chat quality (human preference) | – | Only Muse Spark 1.3 has an Arena rating (69 category score) | Not comparable |
| Lowest cost | Muse Spark 1.3 | $2.00 vs $3.44 per 1M blended; agentic coding session $0.092 vs $0.115 | – |
| Fastest first answer | Either | 35.9 s (GPT-5 (medium)) vs 46.3 s (Muse Spark 1.3 (max)) to the first answer token | – |
| High volume on a budget | Neither flagship | A smaller model is usually the better fit: Cheapest good LLMs, Fastest LLMs | – |
Key differences
- GPT-5 (medium) and Muse Spark 1.3 (max) are neck and neck on quality (58.2 vs 61.9, within the ±6.4 margin).
- GPT-5 (medium) is stronger in instruction following, long context, maths.
- Muse Spark 1.3 (max) is stronger in agents & tools, coding, multimodal, reasoning, human preference, knowledge.
- Muse Spark 1.3 (max) is 1.7× cheaper ($2.00 vs $3.44 per 1M blended).
- Muse Spark 1.3 (max) streams 1.7× faster (194 vs 115 tokens per second).
At a glance
| Spec | GPT-5 | Muse Spark 1.3 |
|---|---|---|
| Developer | OpenAI | Meta |
| Released | 7 Aug 2025 | 2 Sep 2026 |
| Context window (tokens) | 400,000 | 1,048,576 |
| Compared at | GPT-5 (medium) | Muse Spark 1.3 (max) |
| Open weights | No | No |
| Price in / out / cached input per 1M | $1.25 / $10.00 / $0.125 | $1.25 / $4.25 / $0.150 |
Category by category
Category scores on the BenchLeader scale: 50 is the average evaluated model, 15 points is one standard deviation. A gap under one point is called level.
| Category | GPT-5 (medium) | Muse Spark 1.3 (max) | Leader |
|---|---|---|---|
| Reasoning | 48.3 | 60.6 | Muse Spark 1.3 |
| Coding | 51.1 | 60.8 | Muse Spark 1.3 |
| Agents & tools | 57.2 | 65.5 | Muse Spark 1.3 |
| Maths | 65.6 | 63.1 | GPT-5 |
| Knowledge | – | 58.5 | not comparable |
| Instruction following | 69.3 | – | not comparable |
| Human preference | – | 68.8 | not comparable |
| Multimodal | 56.8 | 65.7 | Muse Spark 1.3 |
| Long context | 70.2 | 66.4 | GPT-5 |
On one chart
Each domain on the index's own scale, where 50 is an average model. Click a domain to see the benchmarks behind it. Pick up to 5 models from the list.
Not drawn, measured for fewer than two of these models: Knowledge, Instruction following, Human preference.
ModelIndex
Where sources disagree
Across the 8 benchmarks both have, GPT-5 leads 0, Muse Spark 1.3 leads 8. Every overall index that rates both puts Muse Spark 1.3 ahead.
| Overall index | GPT-5 (medium) | Muse Spark 1.3 (max) | Leader |
|---|---|---|---|
| BenchLeader Index | 58.2 | 61.9 | neck and neck |
| Arena Text | 1435† | 1495 | Muse Spark 1.3 |
Each publisher runs its own tasks, harnesses and effort settings, so their overall verdicts can differ; BenchLeader reconciles them on one scale. † measured at another effort setting of the same model (the publisher did not test the one compared here).
Price, speed and latency
List prices blended at three input tokens per output token. Per-task prices use the token counts on the methodology page. Cost, tokens and time per benchmark task are measured: Artificial Analysis’ averages over its whole Intelligence Index run.
| Measure | GPT-5 (medium) | Muse Spark 1.3 (max) |
|---|---|---|
| Blended price per 1M tokens | $3.44 | $2.00 |
| Input / output per 1M | $1.25 / $10.00 | $1.25 / $4.25 |
| Cached input per 1M | $0.125 | $0.150 |
| Price per task: chat reply | $0.0035 | $0.0018 |
| Price per task: summarize a 30-page report | $0.021 | $0.018 |
| Price per task: code edit | $0.022 | $0.014 |
| Price per task: agentic coding session | $0.115 | $0.092 |
| Price per task: structured extraction | $0.0045 | $0.0034 |
| Agentic coding session, input mostly cached | $0.064 | $0.043 |
| Cost per benchmark task (AA Index) | – | $2.39 |
| Output tokens per task (AA Index) | – | 91k |
| Of which reasoning | – | 55k |
| Time per task (AA Index) | – | 8 min |
| Output speed | 115 tok/s | 194 tok/s |
| Time to first answer | 35.9 s | 46.3 s |
| Time to a complete answer | 40.2 s | 48.9 s |
Each model is compared at its best-ranked reasoning-effort setting. GPT-5 (medium) scores 58.2 and takes 36 s to its first answer token; GPT-5 (high) scores 57.9 in 67 s, GPT-5 scores 57.7 in 4 s. Muse Spark 1.3 (max) scores 61.9 and takes 46 s to its first answer token; Muse Spark 1.3 (xhigh) scores 58.5 in 22 s, Muse Spark 1.3 scores 57.8 in 2 s. Higher effort means more thinking before the answer: better scores, longer waits and more tokens billed. How reasoning effort changes scores and cost.
Every benchmark
171 benchmarks, grouped by category; each name links to the board and its leaders. † measured at another effort setting of the same model, shown for reference and not counted as a win.
| Metric | Publisher | GPT-5 (medium) | Muse Spark 1.3 (max) |
|---|---|---|---|
| BenchLeader Index | BenchLeader | 58.2 | 61.9 |
| Agents & tools score | BenchLeader | 57.2 | 65.5 |
| Coding score | BenchLeader | 51.1 | 60.8 |
| Instruction following score | BenchLeader | 69.3 | – |
| Long context score | BenchLeader | 70.2 | 66.4 |
| Maths score | BenchLeader | 65.6 | 63.1 |
| Multimodal score | BenchLeader | 56.8 | 65.7 |
| Reasoning score | BenchLeader | 48.3 | 60.6 |
| Human preference score | BenchLeader | – | 68.8 |
| Knowledge score | BenchLeader | – | 58.5 |
| Blended price $/M | BenchLeader | $3.44 | $2.00 |
| Output speed | BenchLeader | 115 tok/s | 194 tok/s |
| Time to first answer | BenchLeader | 35.9 s | 46.3 s |
| Context window | BenchLeader | 400,000 tokens | 1,048,576 tokens |
| Reasoning | |||
| GPQA Diamond | Epoch AI Benchmarking Hub | 85.3% | – |
| Humanity's Last Exam | Scale AI / CAIS | 25.3%† | – |
| SimpleBench | SimpleBench | 56.7%† | – |
| Arena Hard Prompts | Arena (LMArena) | 1448† | 1516 |
| LiveBench 2.0 Reasoning | LiveBench | – | 89.7%† |
| LiveBench 1.0 Reasoning | LiveBench | – | 89.7%† |
| GPQA Diamond (AA) | Artificial Analysis | 84.2% | 93.5% |
| Humanity's Last Exam (AA) | Artificial Analysis | 25.4% | 48.7% |
| HLE-Diamond (AA) | Artificial Analysis | – | 33.7% |
| GPQA Diamond (Vals) | Vals AI | 85.6%† | – |
| Kagi LLM Benchmark | Kagi LLM Benchmark | 72.7%† | – |
| GPQA Diamond (HELM) | HELM Capabilities | 79.1%† | – |
| ARC-AGI-1 | ARC Prize | 56.2% | – |
| ARC-AGI-2 | ARC Prize | 7.5% | – |
| CritPt | Artificial Analysis | 0.0% | 24.9% |
| CritPt v2 hard subset (AA) | Artificial Analysis | 11.5%† | 46.0% |
| MysteryMechanism | Vals AI | – | 36.0% |
| Chess Puzzles | Epoch AI Benchmarking Hub | 32.0% | 37.0% |
| Mystery Game Puzzles | Epoch AI Benchmarking Hub | 15.0% | 25.0% |
| LMCA | Epoch AI Benchmarking Hub | 40.0%† | 53.9%† |
| DTBench | Epoch AI Benchmarking Hub | 90.7%† | 96.5%† |
| ForecastBench | ForecastBench | 65.3%† | – |
| BTF-3 | Epoch AI Benchmarking Hub | – | 14.1%† |
| Coding | |||
| SWE-bench Verified (Epoch) | Epoch AI Benchmarking Hub | 71.5% | – |
| SciCode | SciCode | 42.9%† | 58.8% |
Show all 171 benchmarks
| Metric | Publisher | GPT-5 (medium) | Muse Spark 1.3 (max) |
|---|---|---|---|
| Coding | |||
| WeirdML | WeirdML | 39.8%† | – |
| GSO-Bench | GSO-Bench | 6.9%† | – |
| Arena Coding | Arena (LMArena) | 1461† | 1534 |
| Arena WebDev | Arena (LMArena) | 1417 | 1656 |
| LiveBench 2.0 Coding | LiveBench | – | 90.2%† |
| LiveBench 1.0 Coding | LiveBench | – | 81.1%† |
| SciCode (AA) | Artificial Analysis | – | 58.8% |
| LiveCodeBench | Vals AI | 85.9%† | – |
| IOI | Vals AI | – | 56.6% |
| SWE-bench (Vals) | Vals AI | 69.0%† | – |
| SWE-Bench Pro | Scale AI SEAL | 41.8%† | – |
| Aider Polyglot | Aider polyglot leaderboard | 88.0%† | – |
| SWE-bench Verified (bash only) | SWE-bench | 65.0% | – |
| SWE-bench Verified (any scaffold) | SWE-bench | 74.4%† | – |
| Code Migration | Vals AI | – | 47.4% |
| ProgramBench | Vals AI | – | 2.5% |
| SWE-bench Multimodal | Vals AI | – | 43.1% |
| Vibe Code Bench 1-100 | Vals AI | – | 20.5% |
| Vibe Code Bench v1.1 | Vals AI | 20.1%† | 85.9% |
| SWE-Bench Pro (private) | Scale AI SEAL | 41.8%† | – |
| MirrorCode | Epoch AI Benchmarking Hub | 4.4%† | – |
| CursorBench | Cursor | – | 41.6% |
| ALE-Bench | Epoch AI Benchmarking Hub | 1162.5† | 1688.3† |
| AlgoTune | AlgoTune | 1.7† | – |
| FrontierSWE | Epoch AI Benchmarking Hub | – | 25.8% |
| Terminal-Bench 4.0 (AA) | Artificial Analysis | – | 33.3% |
| Terminal-Bench 2.1 (AA) | Artificial Analysis | 35.2%† | 84.3% |
| Startrise Frontend | Startrise | – | 74.7%† |
| GameBench 2 Overall | DuelLab GameBench 2 | – | 59.7† |
| GameBench 2 by reasoning setting | DuelLab GameBench 2 | 38.6 | 70.9† |
| FrontierCode 1.1 (AA) | Artificial Analysis | – | 40.6% |
| FrontierCode 2.0 (AA) | Artificial Analysis | – | 23.1% |
| LiveCodeBench (AA) | Artificial Analysis | 70.3% | – |
| Agents & tools | |||
| Terminal-Bench | Terminal-Bench | 49.6% | 14.6%† |
| GDPval | OpenAI | 34.8% | – |
| Remote Labor Index | Scale AI / CAIS | 1.7%† | – |
| APEX-Agents | Mercor | – | 47.6% |
| Arena Agent | Arena (LMArena) | – | 2.6 |
| LiveBench Long Agentic | LiveBench | – | 25.5%† |
| LiveBench Browser | LiveBench | – | 30.9%† |
| LiveBench Agentic Coding | LiveBench | – | 64.1%† |
| Terminal-Bench Hard | Artificial Analysis | 37.9% | – |
| τ²-Bench Telecom (AA) | Artificial Analysis | 86.5% | – |
| Terminal-Bench 2.1 (Vals) | Vals AI | – | 79.0% |
| HiL-Bench | Scale AI SEAL | – | 66.9%† |
| τ³-Banking (AA) | Artificial Analysis | 22.1%† | 50.5% |
| ITBench SRE (AA) | Artificial Analysis | – | 33.2% |
| Analyst Agent (AA) | Artificial Analysis | – | 37.5% |
| CUA-bench | Vals AI | – | 5.8% |
| CyberBench | Vals AI | – | 72.7% |
| Finance Agent v2 | Vals AI | – | 60.0% |
| Harvey's Legal Agent Benchmark v1 | Vals AI | – | 23.8% |
| Legal Research Bench | Vals AI | – | 55.3% |
| Poker Agent | Vals AI | 1103.2%† | – |
| SREBench | Vals AI | – | 3.8% |
| Tax Agent Bench | Vals AI | – | 42.4% |
| Terminal-Bench 2.0 (Vals) | Vals AI | 37.1%† | – |
| Terminal-Bench 4.0 (Vals) | Vals AI | – | 24.8% |
| Terminal-Bench Science | Vals AI | – | 10.0% |
| BALROG | BALROG | 32.8%† | – |
| DeepResearch Bench | DeepResearch Bench | 48.6% | – |
| METR Time Horizons | METR | 69.6% | – |
| AutomationBench | Artificial Analysis | – | 57.9% |
| GDP.pdf (AA) | Artificial Analysis | – | 26.6% |
| Harvey LAB-AA v1.1 | Harvey | – | 8.9% |
| AA-Briefcase v1.1 | Artificial Analysis | – | 1581 |
| Terminal-Bench-Science 0.1 (AA) | Artificial Analysis | – | 10.9% |
| BrowseComp-Plus | BrowseComp-Plus | 57.6%† | – |
| BrowseComp | OpenAI | 20.1%† | – |
| DeepSearchQA | 59.4%† | – | |
| Maths | |||
| FrontierMath Tiers 1–3 | Epoch AI Benchmarking Hub | 55.4%† | 74.0% |
| FrontierMath Tier 4 | Epoch AI Benchmarking Hub | 21.9%† | 46.3% |
| OTIS Mock AIME | Epoch AI Benchmarking Hub | 87.2% | 99.2%† |
| MATH Level 5 | Epoch AI Benchmarking Hub | 97.9% | – |
| ProofBench | Vals AI | 18.0%† | 58.0% |
| LiveBench Mathematics | LiveBench | – | 96.0%† |
| AIME (Vals) | Vals AI | 93.4%† | – |
| MGSM | Vals AI | 92.8%† | – |
| IMO 2025 | MathArena | 38.1%† | – |
| MathArena Apex | MathArena | 1.0%† | – |
| Omni-MATH (HELM) | HELM Capabilities | 64.7%† | – |
| MATH 500 | Vals AI | 96.0%† | – |
| Arena Maths | Arena (LMArena) | 1410† | 1508 |
| Knowledge | |||
| SimpleQA Verified | Epoch AI Benchmarking Hub | 50.1%† | – |
| LiveBench 2.0 Data Analysis | LiveBench | – | 79.6%† |
| LiveBench Research | LiveBench | – | 68.6%† |
| LiveBench 1.0 Data Analysis | LiveBench | – | 79.6%† |
| AA-Omniscience v1.1 | Artificial Analysis | – | 22.4 |
| MMLU-Pro | Vals AI | 86.5%† | – |
| LegalBench | Vals AI | 86.0%† | – |
| CorpFin | Vals AI | 61.1%† | – |
| TaxEval | Vals AI | 73.4%† | – |
| MedQA | Vals AI | 96.3%† | – |
| PRBench Finance | Scale AI SEAL | 51.3%† | 59.5%† |
| PRBench Legal | Scale AI SEAL | 49.0%† | 61.6%† |
| MultiNRC | Scale AI SEAL | 52.1%† | – |
| MMLU-Pro (HELM) | HELM Capabilities | 86.3%† | – |
| CaseLaw v2 | Vals AI | 66.5%† | – |
| Excel Modeling Benchmark | Vals AI | – | 67.4% |
| MedCode | Vals AI | 49.6%† | – |
| MedScribe | Vals AI | 83.7%† | – |
| DrugDiscoveryBench | Scale AI SEAL | – | 62.2%† |
| EBR-bench | Epoch AI Benchmarking Hub | 12.7%† | – |
| GDP.pdf | Epoch AI Benchmarking Hub | – | 27.6%† |
| AA-Omniscience v1.1: accuracy | Artificial Analysis | – | 38.0% |
| AA-Omniscience v1.1: non-hallucination | Artificial Analysis | – | 74.8% |
| Global-MMLU-Lite (AA) | Artificial Analysis | 90.7%† | – |
| Instruction following | |||
| LiveBench Language | LiveBench | – | 82.8%† |
| LiveBench Instruction Following | LiveBench | – | 78.0%† |
| IFBench | Artificial Analysis | 70.6% | – |
| MultiChallenge | Scale AI SEAL | 63.2%† | – |
| TutorBench | Scale AI SEAL | 55.3%† | – |
| IFEval (HELM) | HELM Capabilities | 87.5%† | – |
| WildBench (HELM) | HELM Capabilities | 85.7%† | – |
| Arena Instruction Following | Arena (LMArena) | 1415† | 1483 |
| Human preference | |||
| Arena Text | Arena (LMArena) | 1426† | 1495 |
| Arena Creative Writing | Arena (LMArena) | 1389† | 1464 |
| Arena Multi-turn | Arena (LMArena) | 1449† | 1493 |
| Arena Longer Queries | Arena (LMArena) | 1435† | 1496 |
| Lech Mazur Creative Writing | Lech Mazur | 86.0% | – |
| Multimodal | |||
| Arena Vision | Arena (LMArena) | 1232† | 1308 |
| LiveBench Design | LiveBench | – | 74.8%† |
| MMMU-Pro | Artificial Analysis | 74.3% | 82.0%† |
| VISTA | Scale AI SEAL | 49.7%† | – |
| MMMU-Pro (Vals) | Vals AI | 81.5%† | – |
| MortgageTax | Vals AI | 65.5%† | – |
| VTB | Scale AI SEAL | 17.0%† | – |
| GeoBench | GeoBench | 81.0% | – |
| VPCT | Epoch AI Benchmarking Hub | 63.2% | – |
| Code2Video-AA | Artificial Analysis | – | 1019 |
| AA-3D | Artificial Analysis | – | 1033 |
| Long context | |||
| Fiction.LiveBench 120k | Fiction.live | 96.9% | – |
| AA-LCR v1.1 | Artificial Analysis | 76.0% | 83.0% |
| Arena Document | Arena (LMArena) | – | 1468 |
| MLCR | Artificial Analysis | – | 13.9% |
| Composite | |||
| Epoch Capabilities Index | Epoch AI Benchmarking Hub | 150† | 157.4† |
| LiveBench 2.0 | LiveBench | – | 63.0%† |
| LiveBench 1.0 | LiveBench | – | 81.6%† |
| AA Intelligence Index v5.0 | Artificial Analysis | – | 36.4 |
| AA Intelligence Index v4.3.2 | Artificial Analysis | 22.9 | 48.1 |
| AA Progress Index v1 | Artificial Analysis | 264.4 | 324.5 |
| HELM Capabilities mean | HELM Capabilities | 80.7%† | – |
| Vals RSI Index | Vals AI | – | 19.6% |
| Safety & honesty | |||
| FORTRESS | Scale AI SEAL | 17.0%† | – |
| MASK | Scale AI SEAL | 79.3%† | – |
| Metadata | |||
| AA Openness Index | Artificial Analysis | 5.6† | – |
Data as of 2026-11-02. Best configuration of each model; every score links to its source on the model pages.
DuelLab GameBench 2, release gb2-20261026-cb69502a12d9 (https://benchmarks.duellab.org/releases/gb2-20261026-cb69502a12d9/), CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Scores mapped to BenchLeader model names; not endorsed by DuelLab.
What changed
- GPT-5 (medium): 1 score revision.
- Muse Spark 1.3 (max): 1 score revision.
- Muse Spark 1.3 (max): BenchLeader Index 64.5 → 61.8.
- GPT-5 (medium): 1 new result (AA Progress Index v1).
- Muse Spark 1.3 (max): 5 new results (AA Intelligence Index v5.0, AA Progress Index v1, HLE-Diamond (AA)…); 3 score revisions; cost per task moved from $1.31/M to $2.39/M (81% up).
- Muse Spark 1.3 (max): cost per task moved from $3.69/M to $1.31/M (64% down).
- Muse Spark 1.3 (max): cost per task moved from $1.60/M to $3.69/M (130% up).
- Muse Spark 1.3 (max): 3 new results (Harvey's Legal Agent Benchmark v1, Vals RSI Index, SWE-bench Multimodal); 1 score revision.
- Muse Spark 1.3 (max): 1 score revision.
- Muse Spark 1.3 (max): 1 score revision.
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Rankings: Best LLM overall · Best LLM for agents · Best cheap LLMs
GPT-5 vs Muse Spark 1.3: questions
- Is GPT-5 better than Muse Spark 1.3?
- GPT-5 (medium) and Muse Spark 1.3 (max) are neck and neck on quality (58.2 vs 61.9, within the ±6.4 margin). The BenchLeader Index combines every independent quality benchmark; the two are within the margin of error as of 2 Nov 2026, so check the category scores for your use.
- GPT-5 vs Muse Spark 1.3: which is cheaper, and will that change?
- Muse Spark 1.3 is cheaper today: $2.00 against $3.44 per million tokens, blended at three input tokens per output token. No price change has been announced for either.
- Is GPT-5 or Muse Spark 1.3 better for coding?
- Muse Spark 1.3 scores higher in coding (61 vs 51 on the category index, where 50 is average). On Arena WebDev, the top shared coding benchmark, it is 1417 for GPT-5 against 1656 for Muse Spark 1.3.
- Which is faster, GPT-5 or Muse Spark 1.3?
- Muse Spark 1.3 streams ~1.5× faster (194 vs 115 output tokens per second, Artificial Analysis 7-day median).
- Is GPT-5 or Muse Spark 1.3 better for agents and tool use?
- Muse Spark 1.3 scores higher in agentic tasks (66 vs 57 on the category index, where 50 is average).
More questions (4)
- Which is better for long documents?
- GPT-5 scores higher on long-context benchmarks (70 vs 66). Muse Spark 1.3 accepts more context: 1,048,576 against 400,000 tokens for GPT-5.
- Which has lower latency?
- GPT-5 answers first: 35.9 s against 46.3 s to the first answer token, as Artificial Analysis measures it. Reasoning effort drives most of this: a higher setting thinks longer before it answers.
- Do independent benchmarks agree on GPT-5 vs Muse Spark 1.3?
- Across the 8 benchmarks both have, GPT-5 leads 0, Muse Spark 1.3 leads 8. Every overall index that rates both puts Muse Spark 1.3 ahead.
- When was Muse Spark 1.3 released?
- Muse Spark 1.3 was released on 2 Sep 2026.