GPT-5.2-Codex vs Muse Spark 1.1
GPT-5.2-Codex 
Muse Spark 1.1 Verdict
- Muse Spark 1.1 leads on quality: 65.0 vs 60.8.
- GPT-5.2-Codex is stronger in agents & tools, long context.
- Muse Spark 1.1 is stronger in coding, composite, instruction following, knowledge, multimodal, human preference, maths, reasoning.
- Muse Spark 1.1 is 2.4× cheaper ($2.00 vs $4.81 per 1M blended).
- Muse Spark 1.1 streams 7.7× faster (194 vs 25 tokens per second).
| Metric | GPT-5.2-Codex | Muse Spark 1.1 |
|---|---|---|
| BenchLeader Index | 60.8 | 65.0 |
| Agents & tools score | 63.5 | 62.7 |
| Coding score | 55.7 | 68.1 |
| Composite score | 56.8 | 72.3 |
| Instruction following score | 75.1 | 77.8 |
| Knowledge score | 63.1 | 73.2 |
| Long context score | 67.8 | 65.4 |
| Multimodal score | 60.7 | 65.0 |
| Human preference score | – | 66.3 |
| Maths score | – | 52.2 |
| Reasoning score | – | 69.2 |
| Blended price $/M | $4.81 | $2.00 |
| Output speed | 25 tok/s | 194 tok/s |
| Time to first answer | 6.7 s | 2.6 s |
| Context window | 400k | 1.0M |
| SimpleQA Verified | – | 57.8% |
| Terminal-Bench | 66.5% | – |
| SciCode | – | 58.2% |
| APEX-Agents | 27.6% | 41.9% |
| ProofBench | – | 39.0% |
| Epoch Capabilities Index | – | 154.6 |
| LMArena Text | – | 1492 |
| LMArena Hard Prompts | – | 1511 |
| LMArena Coding | – | 1531 |
| LMArena WebDev | 1339 | 1541 |
| LMArena Vision | – | 1293 |
| LMArena Agent | – | -2.6 |
| LiveBench | 74.0% | – |
| LiveBench Reasoning | 77.7% | – |
| LiveBench Coding | 83.6% | – |
| LiveBench Agentic Coding | 49.4% | – |
| LiveBench Mathematics | 88.8% | – |
| LiveBench Data Analysis | 78.2% | – |
| LiveBench Language | 73.7% | – |
| AA Intelligence Index | 28.5 | 34.3 |
| IFBench | 77.6% | – |
| AA-LCR | 82.3% | 77.7% |
| MMMU-Pro | 76.3% | – |
| AA-Omniscience | -2.2 | 28.1 |
| Terminal-Bench Hard | 37.1% | – |
| GPQA Diamond (AA) | 89.9% | 89.8% |
| Humanity's Last Exam (AA) | 35.7% | 46.2% |
| SciCode (AA) | – | 58.8% |
| τ²-Bench Telecom (AA) | 92.1% | – |
| LiveCodeBench | 88.0% | – |
| SWE-Bench Pro | 41.0% | 61.5% |
| MCP Atlas | – | 88.1% |
| MultiChallenge | – | 75.3% |
| PRBench Finance | – | 55.0% |
| PRBench Legal | – | 57.0% |
| MultiNRC | – | 65.6% |
| EQ-Bench 4 | – | 1260 |
| SWE-bench Verified (bash only) | 72.8% | – |
| SWE-bench Verified (any scaffold) | 72.8% | – |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
GPT-5.2-Codex vs Muse Spark 1.1: questions
- Is GPT-5.2-Codex better than Muse Spark 1.1?
- Muse Spark 1.1 leads on quality: 65.0 vs 60.8. 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-5.2-Codex better than Muse Spark 1.1 for coding?
- Muse Spark 1.1 scores higher in coding (68 vs 56 on the category index, where 50 is average).
- Is GPT-5.2-Codex better than Muse Spark 1.1 for agentic tasks?
- GPT-5.2-Codex scores higher in agentic tasks (64 vs 63 on the category index, where 50 is average).
- Which is cheaper, GPT-5.2-Codex or Muse Spark 1.1?
- Muse Spark 1.1 is cheaper: $2.00 against $4.81 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5.2-Codex or Muse Spark 1.1?
- Muse Spark 1.1 streams faster: 194 against 25 output tokens per second.
- Which has the larger context window?
- Muse Spark 1.1 accepts more context: 1.0M against 400k tokens.