GPT-5.2-Codex vs Muse Spark 1.2
GPT-5.2-Codex 
Muse Spark 1.2 Verdict
- Muse Spark 1.2 leads on quality: 62.7 vs 60.8.
- GPT-5.2-Codex is stronger in agents & tools, instruction following, long context, multimodal.
- Muse Spark 1.2 is stronger in coding, composite, knowledge, maths, reasoning.
- Muse Spark 1.2 is 2.4× cheaper ($2.00 vs $4.81 per 1M blended).
- Muse Spark 1.2 streams 7.7× faster (193 vs 25 tokens per second).
| Metric | GPT-5.2-Codex | Muse Spark 1.2 |
|---|---|---|
| BenchLeader Index | 60.8 | 62.7 |
| Agents & tools score | 63.5 | – |
| Coding score | 55.7 | 66.5 |
| Composite score | 56.8 | 79.3 |
| Instruction following score | 75.1 | – |
| Knowledge score | 63.1 | 77.1 |
| Long context score | 67.8 | 66.0 |
| Multimodal score | 60.7 | – |
| Maths score | – | 54.3 |
| Reasoning score | – | 70.7 |
| Blended price $/M | $4.81 | $2.00 |
| Output speed | 25 tok/s | 193 tok/s |
| Time to first answer | 6.7 s | 23.4 s |
| Context window | 400k | 1.0M |
| Terminal-Bench | 66.5% | – |
| SimpleBench | – | 74.5% |
| APEX-Agents | 27.6% | – |
| ProofBench | – | 43.0% |
| Epoch Capabilities Index | – | 155.5 |
| LMArena WebDev | 1339 | – |
| 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 | 39.8 |
| IFBench | 77.6% | – |
| AA-LCR | 82.3% | 79.0% |
| MMMU-Pro | 76.3% | – |
| AA-Omniscience | -2.2 | 27.2 |
| Terminal-Bench Hard | 37.1% | – |
| GPQA Diamond (AA) | 89.9% | 90.4% |
| Humanity's Last Exam (AA) | 35.7% | 45.5% |
| SciCode (AA) | – | 57.4% |
| τ²-Bench Telecom (AA) | 92.1% | – |
| LiveCodeBench | 88.0% | – |
| IOI | – | 49.5% |
| SWE-Bench Pro | 41.0% | – |
| 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 1.2: questions
- Is GPT-5.2-Codex better than Muse Spark 1.2?
- Muse Spark 1.2 leads on quality: 62.7 vs 60.8. The BenchLeader Index combines every independent quality benchmark; Muse Spark 1.2 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 1.2 for coding?
- Muse Spark 1.2 scores higher in coding (67 vs 56 on the category index, where 50 is average).
- Which is cheaper, GPT-5.2-Codex or Muse Spark 1.2?
- Muse Spark 1.2 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 1.2?
- Muse Spark 1.2 streams faster: 193 against 25 output tokens per second.
- Which has the larger context window?
- Muse Spark 1.2 accepts more context: 1.0M against 400k tokens.