GPT-5.5 Instant vs Muse Spark 1.1
GPT-5.5 Instant 
Muse Spark 1.1 Verdict
- Muse Spark 1.1 leads on quality: 65.0 vs 60.5.
- GPT-5.5 Instant is stronger in agents & tools, human preference.
- Muse Spark 1.1 is stronger in coding, composite, instruction following, knowledge, long context, maths, multimodal, reasoning.
- Muse Spark 1.1 is 5.6× cheaper ($2.00 vs $11.25 per 1M blended).
- Muse Spark 1.1 streams 1.5× faster (194 vs 129 tokens per second).
| Metric | GPT-5.5 Instant | Muse Spark 1.1 |
|---|---|---|
| BenchLeader Index | 60.5 | 65.0 |
| Agents & tools score | 70.7 | 62.7 |
| Coding score | 61.1 | 68.1 |
| Composite score | 62.9 | 72.3 |
| Human preference score | 67.5 | 66.3 |
| Instruction following score | 69.8 | 77.8 |
| Knowledge score | 69.4 | 73.2 |
| Long context score | 61.4 | 65.4 |
| Maths score | 42.5 | 52.2 |
| Multimodal score | 59.7 | 65.0 |
| Reasoning score | 62.6 | 69.2 |
| Blended price $/M | $11.25 | $2.00 |
| Output speed | 129 tok/s | 194 tok/s |
| Time to first answer | 16.8 s | 2.6 s |
| Context window | 400k | 1.0M |
| GPQA Diamond | 82.5% | – |
| FrontierMath Tiers 1–3 | 26.3% | – |
| FrontierMath Tier 4 | 2.4% | – |
| OTIS Mock AIME | 68.1% | – |
| SimpleQA Verified | – | 57.8% |
| SciCode | 48.6% | 58.2% |
| APEX-Agents | – | 41.9% |
| ProofBench | – | 39.0% |
| Epoch Capabilities Index | 142.5 | 154.6 |
| LMArena Text | 1474 | 1492 |
| LMArena Hard Prompts | 1491 | 1511 |
| LMArena Coding | 1514 | 1531 |
| LMArena WebDev | – | 1541 |
| LMArena Vision | 1251 | 1293 |
| LMArena Agent | – | -2.6 |
| AA Intelligence Index | 26.8 | 34.3 |
| IFBench | 71.5% | – |
| AA-LCR | 70.0% | 77.7% |
| AA-Omniscience | 11.2 | 28.1 |
| Terminal-Bench Hard | 42.4% | – |
| GPQA Diamond (AA) | 84.7% | 89.8% |
| Humanity's Last Exam (AA) | 21.6% | 46.2% |
| SciCode (AA) | 52.5% | 58.8% |
| τ²-Bench Telecom (AA) | 49.4% | – |
| SWE-Bench Pro | – | 61.5% |
| MCP Atlas | – | 88.1% |
| MultiChallenge | – | 75.3% |
| PRBench Finance | – | 55.0% |
| PRBench Legal | – | 57.0% |
| MultiNRC | – | 65.6% |
| EQ-Bench 4 | – | 1260 |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
GPT-5.5 Instant vs Muse Spark 1.1: questions
- Is GPT-5.5 Instant better than Muse Spark 1.1?
- Muse Spark 1.1 leads on quality: 65.0 vs 60.5. The BenchLeader Index combines every independent quality benchmark; Muse Spark 1.1 is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is GPT-5.5 Instant better than Muse Spark 1.1 for coding?
- Muse Spark 1.1 scores higher in coding (68 vs 61 on the category index, where 50 is average).
- Is GPT-5.5 Instant better than Muse Spark 1.1 for agentic tasks?
- GPT-5.5 Instant scores higher in agentic tasks (71 vs 63 on the category index, where 50 is average).
- Which is cheaper, GPT-5.5 Instant or Muse Spark 1.1?
- Muse Spark 1.1 is cheaper: $2.00 against $11.25 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5.5 Instant or Muse Spark 1.1?
- Muse Spark 1.1 streams faster: 194 against 129 output tokens per second.
- Which has the larger context window?
- Muse Spark 1.1 accepts more context: 1.0M against 400k tokens.