GPT-5.6 Terra vs Muse Spark 1.2
Full profiles: GPT-5.6 Terra (OpenAI) and Muse Spark 1.2 (Meta): every benchmark, price and rank.
Updated · Data from 9 sources
As of 25 Oct 2026, GPT-5.6 Terra (max) and Muse Spark 1.2 (xhigh) are neck and neck on quality (64.4 vs 63.2 on the BenchLeader Index, inside the ±6.8 margin of error), and Muse Spark 1.2 (xhigh) costs 2.3× less, which makes it the better buy for most workloads. Pick GPT-5.6 Terra for coding (65 vs 55); pick Muse Spark 1.2 for knowledge (67 vs 57).
GPT-5.6 Terra 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 |
|---|---|---|---|
| Coding | GPT-5.6 Terra | 65 vs 55 category score; IOI 87.6% vs 21.8% | High |
| Agents & tool use | GPT-5.6 Terra | 59 vs 55 category score; τ³-Banking (AA) 40.2% vs 34.9% | Medium |
| Maths | GPT-5.6 Terra | 69 vs 67 category score; LiveBench Mathematics 94.9% vs 91.2% | Medium |
| Reasoning | Either | 70 vs 69 category score; CritPt 30.0% vs 17.7% | Either |
| Knowledge | Muse Spark 1.2 | 67 vs 57 category score; SimpleQA Verified 60.3% vs 43.2% | High |
| Long documents | GPT-5.6 Terra | 67 vs 65 category score; AA-LCR 83.0% vs 79.0% | Medium |
| Images and other media | Muse Spark 1.2 | 65 vs 64 category score; SAGE 47.7% vs 47.0% | 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 $4.50 per 1M blended; agentic coding session $0.092 vs $0.168 | – |
| Fastest first answer | Muse Spark 1.2 | 17.6 s (Muse Spark 1.2 (xhigh)) vs 101.0 s (GPT-5.6 Terra (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-5.6 Terra (max) and Muse Spark 1.2 (xhigh) are neck and neck on quality (64.4 vs 63.2, within the ±6.8 margin).
- GPT-5.6 Terra (max) is stronger in agents & tools, coding, composite, instruction following, long context, maths, reasoning.
- Muse Spark 1.2 (xhigh) is stronger in knowledge, multimodal, human preference.
- Muse Spark 1.2 (xhigh) is 2.3× cheaper ($2.00 vs $4.50 per 1M blended).
- Muse Spark 1.2 (xhigh) streams 2.4× faster (307 vs 126 tokens per second).
At a glance
| Spec | GPT-5.6 Terra | Muse Spark 1.2 |
|---|---|---|
| Developer | OpenAI | Meta |
| Released | 9 Jul 2026 | 5 Aug 2026 |
| Context window (tokens) | 1,050,000 | 1,048,576 |
| Compared at | GPT-5.6 Terra (max) | Muse Spark 1.2 (xhigh) |
| Open weights | No | No |
| Price in / out / cached input per 1M | $2.00 / $12.00 / $0.200 | $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-5.6 Terra (max) | Muse Spark 1.2 (xhigh) | Leader |
|---|---|---|---|
| Reasoning | 70.1 | 69.3 | level |
| Coding | 65.1 | 55.1 | GPT-5.6 Terra |
| Agents & tools | 58.9 | 55.4 | GPT-5.6 Terra |
| Maths | 68.9 | 67.3 | GPT-5.6 Terra |
| Knowledge | 57.2 | 66.7 | Muse Spark 1.2 |
| Instruction following | 69.9 | – | not comparable |
| Human preference | – | 68.6 | not comparable |
| Multimodal | 63.7 | 65.2 | Muse Spark 1.2 |
| Long context | 66.6 | 64.5 | GPT-5.6 Terra |
| Composite | 76.6 | 73.8 | GPT-5.6 Terra |
Where sources disagree
Across the 47 benchmarks both have, GPT-5.6 Terra leads 28, Muse Spark 1.2 leads 18 and 1 is a tie. Independent sources split: GPT-5.6 Terra leads on AA Intelligence Index v4.3.2; Muse Spark 1.2 leads on Arena Text.
| Overall index | GPT-5.6 Terra (max) | Muse Spark 1.2 (xhigh) | Leader |
|---|---|---|---|
| BenchLeader Index | 64.4 | 63.2 | neck and neck |
| AA Intelligence Index v4.3.2 | 42.1 | 39.6 | GPT-5.6 Terra |
| Arena Text | 1467† | 1491 | Muse Spark 1.2 |
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-5.6 Terra (max) | Muse Spark 1.2 (xhigh) |
|---|---|---|
| Blended price per 1M tokens | $4.50 | $2.00 |
| Input / output per 1M | $2.00 / $12.00 | $1.25 / $4.25 |
| Cached input per 1M | $0.200 | $0.150 |
| Price per task: chat reply | $0.0044 | $0.0018 |
| Price per task: summarize a 30-page report | $0.031 | $0.018 |
| Price per task: code edit | $0.030 | $0.014 |
| Price per task: agentic coding session | $0.168 | $0.092 |
| Price per task: structured extraction | $0.0064 | $0.0034 |
| Cost to run a full benchmark suite | $1.40 | $0.975 |
| Output speed | 126 tok/s | 307 tok/s |
| Time to first answer | 101.0 s | 17.6 s |
| Time to a complete answer | 105.0 s | 19.2 s |
Per token is not per task: on Artificial Analysis' full suite GPT-5.6 Terra (max) cost $1.40 and Muse Spark 1.2 (xhigh) $0.975, because Muse Spark 1.2 (xhigh) used about 1.6× as many tokens for the same work, which a per-token price hides.
Each model is compared at its best-ranked reasoning-effort setting. GPT-5.6 Terra (max) scores 64.4 and takes 101 s to its first answer token; GPT-5.6 Terra (xhigh) scores 62.8 in 7 s, GPT-5.6 Terra (high) scores 61.3 in 2 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
116 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-5.6 Terra (max) | Muse Spark 1.2 (xhigh) |
|---|---|---|---|
| BenchLeader Index | BenchLeader | 64.4 | 63.2 |
| Agents & tools score | BenchLeader | 58.9 | 55.4 |
| Coding score | BenchLeader | 65.1 | 55.1 |
| Composite score | BenchLeader | 76.6 | 73.8 |
| Instruction following score | BenchLeader | 69.9 | – |
| Knowledge score | BenchLeader | 57.2 | 66.7 |
| Long context score | BenchLeader | 66.6 | 64.5 |
| Maths score | BenchLeader | 68.9 | 67.3 |
| Multimodal score | BenchLeader | 63.7 | 65.2 |
| Reasoning score | BenchLeader | 70.1 | 69.3 |
| Human preference score | BenchLeader | – | 68.6 |
| Blended price $/M | BenchLeader | $4.50 | $2.00 |
| Output speed | BenchLeader | 126 tok/s | 307 tok/s |
| Time to first answer | BenchLeader | 101.0 s | 17.6 s |
| Context window | BenchLeader | 1,050,000 tokens | 1,048,576 tokens |
| Reasoning | |||
| GPQA Diamond | Epoch AI Benchmarking Hub | 93.3% | – |
| SimpleBench | SimpleBench | 48.9%† | 74.5%† |
| Arena Hard Prompts | Arena (LMArena) | 1490† | 1512 |
| LiveBench 2.0 Reasoning | LiveBench | 90.6%† | 90.0%† |
| LiveBench 1.0 Reasoning | LiveBench | 90.6% | 90.0% |
| GPQA Diamond (AA) | Artificial Analysis | 92.5% | 90.4% |
| Humanity's Last Exam (AA) | Artificial Analysis | 42.9% | 45.5% |
| GPQA Diamond (Vals) | Vals AI | 90.9%† | – |
| Kagi LLM Benchmark | Kagi LLM Benchmark | 51.3%† | – |
| ARC-AGI-1 | ARC Prize | 96.5% | – |
| ARC-AGI-2 | ARC Prize | 83.9% | – |
| ARC-AGI-3 | ARC Prize | 0.8% | – |
| CritPt | Artificial Analysis | 30.0% | 17.7% |
| Chess Puzzles | Epoch AI Benchmarking Hub | 47.0% | 27.0% |
| Mystery Game Puzzles | Epoch AI Benchmarking Hub | 35.0% | – |
| LMCA | Epoch AI Benchmarking Hub | 55.0% | 48.4% |
| DTBench | Epoch AI Benchmarking Hub | 93.3% | 94.7% |
| Coding | |||
| SciCode | SciCode | 55.0% | 57.4% |
| WeirdML | WeirdML | 78.3%† | 60.3% |
| FrontierCode | Cognition | 41.3%† | – |
| Arena Coding | Arena (LMArena) | 1518† | 1541 |
| Arena WebDev | Arena (LMArena) | 1521† | 1533 |
| LiveBench 2.0 Coding | LiveBench | 86.2%† | 78.2%† |
| LiveBench 1.0 Coding | LiveBench | 78.3% | 77.5% |
| LiveCodeBench | Vals AI | 85.9%† | – |
Show all 116 benchmarks
| Metric | Publisher | GPT-5.6 Terra (max) | Muse Spark 1.2 (xhigh) |
|---|---|---|---|
| Coding | |||
| IOI | Vals AI | 87.6% | 21.8% |
| SWE-bench (Vals) | Vals AI | 95.4% | 86.6% |
| Code Migration | Vals AI | 47.8% | 29.9% |
| ProgramBench | Vals AI | 0.5% | 0.5% |
| Vibe Code Bench 1-100 | Vals AI | 14.8% | – |
| Vibe Code Bench v1.1 | Vals AI | 74.6% | 79.1% |
| Surface Evolver Bench | Epoch AI Benchmarking Hub | 83.8%† | – |
| DeepSWE v1.1 | Epoch AI Benchmarking Hub | 69.6% | 54.9% |
| CursorBench | Cursor | 41.3% | – |
| ALE-Bench | Epoch AI Benchmarking Hub | 1951.4 | – |
| FrontierSWE | Epoch AI Benchmarking Hub | – | 12.0% |
| Terminal-Bench 4.0 (AA) | Artificial Analysis | 35.4% | 7.1% |
| Terminal-Bench 2.1 (AA) | Artificial Analysis | 88.0% | 80.2% |
| Startrise Frontend | Startrise | 66.9%† | 70.3%† |
| Agents & tools | |||
| Terminal-Bench | Terminal-Bench | 21.5% | – |
| APEX-Agents | Mercor | 58.2% | 45.4%† |
| Arena Agent | Arena (LMArena) | 0.2† | -7 |
| LiveBench Long Agentic | LiveBench | 48.4%† | 21.3%† |
| LiveBench Browser | LiveBench | 84.0%† | 36.0%† |
| LiveBench Agentic Coding | LiveBench | 55.0% | 57.6% |
| Terminal-Bench Hard | Artificial Analysis | 57.6% | – |
| τ²-Bench Telecom (AA) | Artificial Analysis | 86.3% | – |
| Terminal-Bench 2.1 (Vals) | Vals AI | 77.5% | 69.7% |
| GDPval-AA v2.1 | Artificial Analysis | 47.6% | – |
| τ³-Banking (AA) | Artificial Analysis | 40.2% | 34.9% |
| ITBench SRE (AA) | Artificial Analysis | 51.0% | – |
| APEX-Agents (AA) | Artificial Analysis | 38.9% | – |
| CyberBench | Vals AI | 72.1% | 69.5% |
| Finance Agent v2 | Vals AI | 54.4% | 60.6% |
| Harvey's Legal Agent Benchmark v1 | Vals AI | 0.8% | 25.4% |
| Legal Research Bench | Vals AI | 41.4% | 43.8% |
| SkillsBench | Vals AI | 58.9% | 53.0% |
| SREBench | Vals AI | 9.5% | 0.0% |
| Tax Agent Bench | Vals AI | 30.0% | 32.8% |
| Terminal-Bench 4.0 (Vals) | Vals AI | 22.7% | 6.1% |
| Terminal-Bench Science | Vals AI | 10.0% | – |
| BALROG | BALROG | 53.2% | – |
| Vending-Bench 2 | Andon Labs | 7343.2† | – |
| AutomationBench | Artificial Analysis | 59.6% | 40.6% |
| GDP.pdf (AA) | Artificial Analysis | 24.0% | 17.4% |
| EnterpriseOps-Gym | Artificial Analysis | 38.5% | 47.3% |
| AA-Briefcase v1.1 | Artificial Analysis | – | 1327 |
| Terminal-Bench-Science 0.1 (AA) | Artificial Analysis | 13.8% | – |
| FACTS Search | 81.7%† | – | |
| Maths | |||
| FrontierMath Tiers 1–3 | Epoch AI Benchmarking Hub | 86.0% | – |
| FrontierMath Tier 4 | Epoch AI Benchmarking Hub | 70.7% | – |
| OTIS Mock AIME | Epoch AI Benchmarking Hub | 99.7% | – |
| ProofBench | Vals AI | 74.0%† | 43.0%† |
| LiveBench Mathematics | LiveBench | 94.9% | 91.2% |
| Arena Maths | Arena (LMArena) | 1483† | 1491 |
| Knowledge | |||
| SimpleQA Verified | Epoch AI Benchmarking Hub | 43.2% | 60.3% |
| LiveBench 2.0 Data Analysis | LiveBench | 79.3%† | 76.5%† |
| LiveBench Research | LiveBench | 60.4%† | 67.7%† |
| LiveBench 1.0 Data Analysis | LiveBench | 79.3% | 76.5% |
| AA-Omniscience | Artificial Analysis | 0.1 | 27.2 |
| MMLU-Pro | Vals AI | 86.7%† | 88.3% |
| LegalBench | Vals AI | 85.1% | 85.3% |
| CorpFin | Vals AI | 65.3%† | 70.9% |
| TaxEval | Vals AI | 76.2%† | 80.4% |
| BioMysteryBench | Vals AI | – | 64.8% |
| Excel Modeling Benchmark | Vals AI | 66.2% | 57.0% |
| MedCode | Vals AI | 43.4%† | 49.4% |
| MedScribe | Vals AI | 82.9%† | 90.1% |
| Public Benefits Bench v1.1 | Vals AI | 62.4% | 68.5% |
| GDP.pdf | Epoch AI Benchmarking Hub | 24.7%† | 16.0% |
| AA-Omniscience: accuracy | Artificial Analysis | 46.8% | 45.4% |
| AA-Omniscience: non-hallucination | Artificial Analysis | 12.1% | 66.7% |
| Instruction following | |||
| LiveBench Language | LiveBench | 82.9% | 78.6% |
| LiveBench Instruction Following | LiveBench | 64.6% | 74.3% |
| IFBench | Artificial Analysis | 71.2% | – |
| Arena Instruction Following | Arena (LMArena) | 1464† | 1472 |
| Human preference | |||
| Arena Text | Arena (LMArena) | 1467† | 1491 |
| EQ-Bench 4 | EQ-Bench | 1224† | – |
| Arena Creative Writing | Arena (LMArena) | 1429† | 1439 |
| Arena Multi-turn | Arena (LMArena) | 1472† | 1511 |
| Arena Longer Queries | Arena (LMArena) | 1468† | 1488 |
| Multimodal | |||
| Arena Vision | Arena (LMArena) | 1271† | 1304 |
| LiveBench Design | LiveBench | 76.0%† | 67.1%† |
| MMMU-Pro | Artificial Analysis | 80.7% | – |
| MMMU-Pro (Vals) | Vals AI | 86.5% | 86.1% |
| MortgageTax | Vals AI | 67.3%† | 65.4% |
| SAGE | Vals AI | 47.0% | 47.7% |
| Blueprint-Bench 2 | Epoch AI Benchmarking Hub | 30.8%† | – |
| Long context | |||
| AA-LCR | Artificial Analysis | 83.0% | 79.0% |
| Arena Document | Arena (LMArena) | 1477† | – |
| MLCR | Artificial Analysis | 27.2% | 7.2% |
| Composite | |||
| Epoch Capabilities Index | Epoch AI Benchmarking Hub | 160.1† | 155.1† |
| LiveBench 2.0 | LiveBench | 75.0%† | 62.4%† |
| LiveBench 1.0 | LiveBench | 77.9% | 78.0% |
| AA Intelligence Index v4.3.2 | Artificial Analysis | 42.1 | 39.6 |
| Vals Multimodal Index | Vals AI | 65.1%† | 69.8%† |
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).
- GPT-5.6 Terra (max): 1 new result (Harvey's Legal Agent Benchmark v1).
- Muse Spark 1.2 (xhigh): 1 new result (Harvey's Legal Agent Benchmark v1).
- GPT-5.6 Terra (max): 1 score revision.
- Muse Spark 1.2 (xhigh): 2 score revisions.
- GPT-5.6 Terra (max): BenchLeader Index 63.8 → 64.4.
- Muse Spark 1.2 (xhigh): BenchLeader Index 62.6 → 63.3.
- GPT-5.6 Terra (max): 5 new results (AutomationBench, GDP.pdf (AA), MLCR…).
- Muse Spark 1.2 (xhigh): 4 new results (AutomationBench, GDP.pdf (AA), MLCR…).
- GPT-5.6 Terra (max): 1 new result (SREBench); 1 score revision.
Related comparisons
- GPT-5.6 Terra vs Claude Opus 5.5
- GPT-5.6 Terra vs Gemini 4 Argon
- GPT-5.6 Terra 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-5.5 vs Muse Spark 1.2
Rankings: Best LLM overall · Best LLM for agents · Best cheap LLMs
GPT-5.6 Terra vs Muse Spark 1.2: questions
- Is GPT-5.6 Terra better than Muse Spark 1.2?
- GPT-5.6 Terra (max) and Muse Spark 1.2 (xhigh) are neck and neck on quality (64.4 vs 63.2, within the ±6.8 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-5.6 Terra or Muse Spark 1.2, and will that change?
- Muse Spark 1.2 is cheaper today: $2.00 against $4.50 per million tokens, blended at three input tokens per output token. No price change has been announced for either.
- Is GPT-5.6 Terra better than Muse Spark 1.2 for coding?
- GPT-5.6 Terra scores higher in coding (65 vs 55 on the category index, where 50 is average). On SciCode, the top shared coding benchmark, it is 55.0% for GPT-5.6 Terra against 57.4% for Muse Spark 1.2.
- Is GPT-5.6 Terra better than Muse Spark 1.2 for agents and tool use?
- GPT-5.6 Terra scores higher in agentic tasks (59 vs 55 on the category index, where 50 is average). On τ³-Banking (AA), the top shared agents & tools benchmark, it is 40.2% for GPT-5.6 Terra against 34.9% for Muse Spark 1.2.
- Which is better for long documents?
- GPT-5.6 Terra scores higher on long-context benchmarks (67 vs 65). Both take about 1.1M tokens: GPT-5.6 Terra 1,050,000, Muse Spark 1.2 1,048,576.
- Which has lower latency?
- Muse Spark 1.2 (xhigh) answers first: 17.6 s against 101.0 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-5.6 Terra or Muse Spark 1.2?
- Muse Spark 1.2 streams faster: 307 against 126 output tokens per second.
- Do independent benchmarks agree on GPT-5.6 Terra vs Muse Spark 1.2?
- Across the 47 benchmarks both have, GPT-5.6 Terra leads 28, Muse Spark 1.2 leads 18 and 1 is a tie. Independent sources split: GPT-5.6 Terra leads on AA Intelligence Index v4.3.2; Muse Spark 1.2 leads on Arena Text.
- When was Muse Spark 1.2 released?
- Muse Spark 1.2 was released on 5 Aug 2026.