GPT-5.1 vs Muse Spark 1.3
GPT-5.1 
Muse Spark 1.3 Verdict
- Muse Spark 1.3 leads on quality: 68.3 vs 59.4.
- GPT-5.1 is stronger in agents & tools, coding, human preference, instruction following, maths, multimodal, reasoning.
- Muse Spark 1.3 is stronger in composite, knowledge, long context.
- Muse Spark 1.3 is 1.7× cheaper ($2.00 vs $3.44 per 1M blended).
- Muse Spark 1.3 streams 2.2× faster (241 vs 107 tokens per second).
| Metric | GPT-5.1 | Muse Spark 1.3 |
|---|---|---|
| BenchLeader Index | 59.4 | 68.3 |
| Agents & tools score | 55.7 | – |
| Coding score | 47.0 | – |
| Composite score | 60.5 | 90.3 |
| Human preference score | 63.2 | – |
| Instruction following score | 70.8 | – |
| Knowledge score | 67.0 | 79.1 |
| Long context score | 66.7 | 68.2 |
| Maths score | 57.1 | – |
| Multimodal score | 61.8 | – |
| Reasoning score | 58.6 | – |
| Blended price $/M | $3.44 | $2.00 |
| Output speed | 107 tok/s | 241 tok/s |
| Time to first answer | 23.3 s | 30.5 s |
| Context window | 400k | 1.0M |
| Humanity's Last Exam | 23.7% | – |
| Terminal-Bench | 47.6% | – |
| SciCode | 43.3% | – |
| APEX-Agents | 17.5% | – |
| GSO-Bench | 13.7% | – |
| Epoch Capabilities Index | 149.6 | – |
| LMArena Text | 1439 | – |
| LMArena Hard Prompts | 1456 | – |
| LMArena Coding | 1475 | – |
| LMArena WebDev | 1341 | – |
| LMArena Vision | 1235 | – |
| AA Intelligence Index | 24.7 | 48.2 |
| IFBench | 72.9% | – |
| AA-LCR | 80.0% | 83.0% |
| MMMU-Pro | 75.5% | – |
| AA-Omniscience | 5.4 | 25 |
| Terminal-Bench Hard | 45.5% | – |
| GPQA Diamond (AA) | 87.3% | 93.5% |
| Humanity's Last Exam (AA) | 28.5% | 48.7% |
| SciCode (AA) | – | 58.8% |
| τ²-Bench Telecom (AA) | 81.9% | – |
| PRBench Finance | – | 59.5% |
| PRBench Legal | – | 61.6% |
| MMMU (validation) | 85.4% | – |
| MMMU-Pro (official) | 76.0% | – |
| IFEval (HELM) | 93.5% | – |
| Omni-MATH (HELM) | 46.4% | – |
| WildBench (HELM) | 86.3% | – |
| MMLU-Pro (HELM) | 57.9% | – |
| GPQA Diamond (HELM) | 44.2% | – |
| HELM Capabilities mean | 65.6% | – |
Data as of 2026-09-14. Best configuration of each model; every score links to its source on the model pages.
GPT-5.1 vs Muse Spark 1.3: questions
- Is GPT-5.1 better than Muse Spark 1.3?
- Muse Spark 1.3 leads on quality: 68.3 vs 59.4. The BenchLeader Index combines every independent quality benchmark; Muse Spark 1.3 is ahead overall as of 2026-09-14, but check the category scores for your use.
- Which is cheaper, GPT-5.1 or Muse Spark 1.3?
- Muse Spark 1.3 is cheaper: $2.00 against $3.44 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5.1 or Muse Spark 1.3?
- Muse Spark 1.3 streams faster: 241 against 107 output tokens per second.
- Which has the larger context window?
- Muse Spark 1.3 accepts more context: 1.0M against 400k tokens.