GPT-5.4 Pro vs Muse Spark 1.2
Full profiles: GPT-5.4 Pro (OpenAI) and Muse Spark 1.2 (Meta): every benchmark, price and rank.
Updated · Data from 8 sources
As of 25 Oct 2026, GPT-5.4 Pro and Muse Spark 1.2 (xhigh) are neck and neck on quality (63.3 vs 63.2 on the BenchLeader Index, inside the ±5.7 margin of error), and Muse Spark 1.2 (xhigh) costs 34× less, which makes it the better buy for most workloads. GPT-5.4 Pro leads in every category we measure both in.
GPT-5.4 Pro benchmarks 
Muse Spark 1.2 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 |
|---|---|---|---|
| Reasoning | GPT-5.4 Pro | 73 vs 69 category score | Medium |
| Knowledge | GPT-5.4 Pro | 74 vs 67 category score | Medium |
| Images and other media | GPT-5.4 Pro | 70 vs 65 category score | Medium |
| Chat quality (human preference) | – | Only Muse Spark 1.2 has an Arena rating (69 category score) | Not comparable |
| Lowest cost | Muse Spark 1.2 | $2.00 vs $67.50 per 1M blended; agentic coding session $0.092 vs $2.52 | – |
| Fastest first answer | GPT-5.4 Pro | 6.1 s (GPT-5.4 Pro) vs 17.6 s (Muse Spark 1.2 (xhigh)) 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-5.4 Pro and Muse Spark 1.2 (xhigh) are neck and neck on quality (63.3 vs 63.2, within the ±5.7 margin).
- GPT-5.4 Pro is stronger in instruction following, knowledge, multimodal, reasoning.
- Muse Spark 1.2 (xhigh) is stronger in agents & tools, coding, composite, human preference, long context, maths.
- Muse Spark 1.2 (xhigh) is 34× cheaper ($2.00 vs $67.50 per 1M blended).
- Muse Spark 1.2 (xhigh) streams 43.9× faster (307 vs 7 tokens per second).
At a glance
| Spec | GPT-5.4 Pro | Muse Spark 1.2 |
|---|---|---|
| Developer | OpenAI | Meta |
| Released | 4 Mar 2026 | 5 Aug 2026 |
| Context window (tokens) | 1,050,000 | 1,048,576 |
| Compared at | GPT-5.4 Pro | Muse Spark 1.2 (xhigh) |
| Open weights | No | No |
| Price in / out / cached input per 1M | $30.00 / $180.00 / – | $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-5.4 Pro | Muse Spark 1.2 (xhigh) | Leader |
|---|---|---|---|
| Reasoning | 72.5 | 69.3 | GPT-5.4 Pro |
| Coding | – | 55.1 | not comparable |
| Agents & tools | – | 55.4 | not comparable |
| Maths | – | 67.3 | not comparable |
| Knowledge | 73.6 | 66.7 | GPT-5.4 Pro |
| Instruction following | 63.8 | – | not comparable |
| Human preference | – | 68.6 | not comparable |
| Multimodal | 69.8 | 65.2 | GPT-5.4 Pro |
| Long context | – | 64.5 | not comparable |
| Composite | – | 73.8 | not comparable |
Where sources disagree
Across the 0 benchmarks both have, GPT-5.4 Pro leads 0, Muse Spark 1.2 leads 0.
| Overall index | GPT-5.4 Pro | Muse Spark 1.2 (xhigh) | Leader |
|---|---|---|---|
| BenchLeader Index | 63.3 | 63.2 | neck and neck |
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; suite cost is what Artificial Analysis paid to run its whole Intelligence Index.
| Measure | GPT-5.4 Pro | Muse Spark 1.2 (xhigh) |
|---|---|---|
| Blended price per 1M tokens | $67.50 | $2.00 |
| Input / output per 1M | $30.00 / $180.00 | $1.25 / $4.25 |
| Cached input per 1M | – | $0.150 |
| Price per task: chat reply | $0.066 | $0.0018 |
| Price per task: summarize a 30-page report | $0.468 | $0.018 |
| Price per task: code edit | $0.450 | $0.014 |
| Price per task: agentic coding session | $2.52 | $0.092 |
| Price per task: structured extraction | $0.096 | $0.0034 |
| Cost to run a full benchmark suite | – | $0.975 |
| Output speed | 7 tok/s | 307 tok/s |
| Time to first answer | 6.1 s | 17.6 s |
| Time to a complete answer | – | 19.2 s |
Each model is compared at its best-ranked reasoning-effort setting. GPT-5.4 Pro scores 63.3 and takes 6 s to its first answer token; GPT-5.4 Pro (xhigh) scores 61.9 in 6 s. Muse Spark 1.2 (xhigh) scores 63.2 and takes 18 s to its first answer token. 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
97 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-5.4 Pro | Muse Spark 1.2 (xhigh) |
|---|---|---|---|
| BenchLeader Index | BenchLeader | 63.3 | 63.2 |
| Instruction following score | BenchLeader | 63.8 | – |
| Knowledge score | BenchLeader | 73.6 | 66.7 |
| Multimodal score | BenchLeader | 69.8 | 65.2 |
| Reasoning score | BenchLeader | 72.5 | 69.3 |
| Agents & tools score | BenchLeader | – | 55.4 |
| Coding score | BenchLeader | – | 55.1 |
| Composite score | BenchLeader | – | 73.8 |
| Human preference score | BenchLeader | – | 68.6 |
| Long context score | BenchLeader | – | 64.5 |
| Maths score | BenchLeader | – | 67.3 |
| Blended price $/M | BenchLeader | $67.50 | $2.00 |
| Output speed | BenchLeader | 7 tok/s | 307 tok/s |
| Time to first answer | BenchLeader | 6.1 s | 17.6 s |
| Context window | BenchLeader | 1,050,000 tokens | 1,048,576 tokens |
| Reasoning | |||
| GPQA Diamond | Epoch AI Benchmarking Hub | 94.6%† | – |
| Humanity's Last Exam | Scale AI / CAIS | 44.3% | – |
| SimpleBench | SimpleBench | 74.1% | 74.5%† |
| Arena Hard Prompts | Arena (LMArena) | – | 1512 |
| LiveBench 2.0 Reasoning | LiveBench | – | 90.0%† |
| LiveBench 1.0 Reasoning | LiveBench | – | 90.0% |
| GPQA Diamond (AA) | Artificial Analysis | – | 90.4% |
| Humanity's Last Exam (AA) | Artificial Analysis | – | 45.5% |
| ARC-AGI-1 | ARC Prize | 94.5%† | – |
| ARC-AGI-2 | ARC Prize | 83.3%† | – |
| CritPt | Artificial Analysis | 30.0%† | 17.7% |
| Chess Puzzles | Epoch AI Benchmarking Hub | 59.0%† | 27.0% |
| LMCA | Epoch AI Benchmarking Hub | – | 48.4% |
| DTBench | Epoch AI Benchmarking Hub | – | 94.7% |
| Coding | |||
| SciCode | SciCode | – | 57.4% |
| WeirdML | WeirdML | 57.4%† | 60.3% |
| Arena Coding | Arena (LMArena) | – | 1541 |
| Arena WebDev | Arena (LMArena) | – | 1533 |
| LiveBench 2.0 Coding | LiveBench | – | 78.2%† |
| LiveBench 1.0 Coding | LiveBench | – | 77.5% |
| IOI | Vals AI | – | 21.8% |
| SWE-bench (Vals) | Vals AI | – | 86.6% |
| Code Migration | Vals AI | – | 29.9% |
| ProgramBench | Vals AI | – | 0.5% |
| Vibe Code Bench v1.1 | Vals AI | – | 79.1% |
Show all 97 benchmarks
| Metric | Publisher | GPT-5.4 Pro | Muse Spark 1.2 (xhigh) |
|---|---|---|---|
| Coding | |||
| DeepSWE v1.1 | Epoch AI Benchmarking Hub | – | 54.9% |
| FrontierSWE | Epoch AI Benchmarking Hub | – | 12.0% |
| Terminal-Bench 4.0 (AA) | Artificial Analysis | – | 7.1% |
| Terminal-Bench 2.1 (AA) | Artificial Analysis | – | 80.2% |
| Startrise Frontend | Startrise | – | 70.3%† |
| Agents & tools | |||
| APEX-Agents | Mercor | – | 45.4%† |
| Arena Agent | Arena (LMArena) | – | -7 |
| LiveBench Long Agentic | LiveBench | – | 21.3%† |
| LiveBench Browser | LiveBench | – | 36.0%† |
| LiveBench Agentic Coding | LiveBench | – | 57.6% |
| Terminal-Bench 2.1 (Vals) | Vals AI | – | 69.7% |
| τ³-Banking (AA) | Artificial Analysis | – | 34.9% |
| CyberBench | Vals AI | – | 69.5% |
| Finance Agent v2 | Vals AI | – | 60.6% |
| Harvey's Legal Agent Benchmark v1 | Vals AI | – | 25.4% |
| Legal Research Bench | Vals AI | – | 43.8% |
| SkillsBench | Vals AI | – | 53.0% |
| SREBench | Vals AI | – | 0.0% |
| Tax Agent Bench | Vals AI | – | 32.8% |
| Terminal-Bench 4.0 (Vals) | Vals AI | – | 6.1% |
| AutomationBench | Artificial Analysis | – | 40.6% |
| GDP.pdf (AA) | Artificial Analysis | – | 17.4% |
| EnterpriseOps-Gym | Artificial Analysis | – | 47.3% |
| AA-Briefcase v1.1 | Artificial Analysis | – | 1327 |
| Maths | |||
| FrontierMath Tiers 1–3 | Epoch AI Benchmarking Hub | 82.5%† | – |
| FrontierMath Tier 4 | Epoch AI Benchmarking Hub | 58.5%† | – |
| ProofBench | Vals AI | – | 43.0%† |
| LiveBench Mathematics | LiveBench | – | 91.2% |
| MathArena Apex | MathArena | 69.8%† | – |
| Arena Maths | Arena (LMArena) | – | 1491 |
| Knowledge | |||
| SimpleQA Verified | Epoch AI Benchmarking Hub | 46.3%† | 60.3% |
| LiveBench 2.0 Data Analysis | LiveBench | – | 76.5%† |
| LiveBench Research | LiveBench | – | 67.7%† |
| LiveBench 1.0 Data Analysis | LiveBench | – | 76.5% |
| AA-Omniscience | Artificial Analysis | – | 27.2 |
| MMLU-Pro | Vals AI | – | 88.3% |
| LegalBench | Vals AI | – | 85.3% |
| CorpFin | Vals AI | – | 70.9% |
| TaxEval | Vals AI | – | 80.4% |
| MultiNRC | Scale AI SEAL | 62.3% | – |
| BioMysteryBench | Vals AI | – | 64.8% |
| Excel Modeling Benchmark | Vals AI | – | 57.0% |
| MedCode | Vals AI | – | 49.4% |
| MedScribe | Vals AI | – | 90.1% |
| Public Benefits Bench v1.1 | Vals AI | – | 68.5% |
| GDP.pdf | Epoch AI Benchmarking Hub | – | 16.0% |
| AA-Omniscience: accuracy | Artificial Analysis | – | 45.4% |
| AA-Omniscience: non-hallucination | Artificial Analysis | – | 66.7% |
| Instruction following | |||
| LiveBench Language | LiveBench | – | 78.6% |
| LiveBench Instruction Following | LiveBench | – | 74.3% |
| MultiChallenge | Scale AI SEAL | 69.2% | – |
| TutorBench | Scale AI SEAL | 56.6% | – |
| Arena Instruction Following | Arena (LMArena) | – | 1472 |
| Human preference | |||
| Arena Text | Arena (LMArena) | – | 1491 |
| Arena Creative Writing | Arena (LMArena) | – | 1439 |
| Arena Multi-turn | Arena (LMArena) | – | 1511 |
| Arena Longer Queries | Arena (LMArena) | – | 1488 |
| Multimodal | |||
| Arena Vision | Arena (LMArena) | – | 1304 |
| LiveBench Design | LiveBench | – | 67.1%† |
| VISTA | Scale AI SEAL | 53.9% | – |
| MMMU-Pro (Vals) | Vals AI | – | 86.1% |
| MortgageTax | Vals AI | – | 65.4% |
| SAGE | Vals AI | – | 47.7% |
| Long context | |||
| AA-LCR | Artificial Analysis | – | 79.0% |
| MLCR | Artificial Analysis | – | 7.2% |
| Composite | |||
| Epoch Capabilities Index | Epoch AI Benchmarking Hub | 159.6 | 155.1† |
| LiveBench 2.0 | LiveBench | – | 62.4%† |
| LiveBench 1.0 | LiveBench | – | 78.0% |
| AA Intelligence Index v4.3.2 | Artificial Analysis | – | 39.6 |
| Vals Multimodal Index | Vals AI | – | 69.8%† |
| Safety & honesty | |||
| FORTRESS | Scale AI SEAL | 14.8% | – |
| MASK | Scale AI SEAL | 91.7% | – |
Data as of 2026-10-25. Best configuration of each model; every score links to its source on the model pages.
What changed
- Muse Spark 1.2 (xhigh): 1 new result (AA-Briefcase v1.1).
- Muse Spark 1.2 (xhigh): 1 new result (Harvey's Legal Agent Benchmark v1).
- GPT-5.4 Pro: 1 score revision.
- Muse Spark 1.2 (xhigh): 2 score revisions.
- Muse Spark 1.2 (xhigh): BenchLeader Index 62.6 → 63.3.
- Muse Spark 1.2 (xhigh): 4 new results (AutomationBench, GDP.pdf (AA), MLCR…).
- Muse Spark 1.2 (xhigh): 3 new results (Chess Puzzles, ProgramBench, SREBench); 1 score revision.
- Muse Spark 1.2 (xhigh): 3 score revisions.
- Muse Spark 1.2 (xhigh): 1 score revision.
- GPT-5.4 Pro: BenchLeader Index 62.1 → 63.6.
Related comparisons
- GPT-5.4 Pro vs Claude Opus 5.5
- GPT-5.4 Pro vs Gemini 4 Argon
- GPT-5.4 Pro vs Muse Wonder Full
- Muse Spark 1.2 vs Claude Opus 5.5
- Muse Spark 1.2 vs Gemini 4 Argon
- Muse Spark 1.2 vs Muse Wonder Full
- Muse Spark 1.2 vs Claude Fable 5.1
- GPT-5.3-Codex vs Muse Spark 1.2
Rankings: Best LLM overall · Best LLM for agents · Best cheap LLMs
GPT-5.4 Pro vs Muse Spark 1.2: questions
- Is GPT-5.4 Pro better than Muse Spark 1.2?
- GPT-5.4 Pro and Muse Spark 1.2 (xhigh) are neck and neck on quality (63.3 vs 63.2, within the ±5.7 margin). The BenchLeader Index combines every independent quality benchmark; the two are within the margin of error as of 2026-10-25, so check the category scores for your use.
- Which is cheaper, GPT-5.4 Pro or Muse Spark 1.2, and will that change?
- Muse Spark 1.2 is cheaper today: $2.00 against $67.50 per million tokens, blended at three input tokens per output token. No price change has been announced for either.
- Which is better for long documents?
- Both take about 1.1M tokens: GPT-5.4 Pro 1,050,000, Muse Spark 1.2 1,048,576.
- Which has lower latency?
- GPT-5.4 Pro answers first: 6.1 s against 17.6 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.
- Which is faster, GPT-5.4 Pro or Muse Spark 1.2?
- Muse Spark 1.2 streams faster: 307 against 7 output tokens per second.
- When was Muse Spark 1.2 released?
- Muse Spark 1.2 was released on 5 Aug 2026.