GPT-5.2-Codex vs GPT-6 Sol
GPT-5.2-Codex Verdict
- GPT-6 Sol (max) leads on quality: 67.7 vs 60.0.
- GPT-5.2-Codex (xhigh) is stronger in agents & tools, instruction following.
- GPT-6 Sol (max) is stronger in composite, knowledge, long context, multimodal, reasoning.
- GPT-6 Sol (max) is 1.2× cheaper ($4.00 vs $4.81 per 1M blended).
- GPT-6 Sol (max) streams 5.3× faster (126 vs 24 tokens per second).
| Metric | GPT-5.2-Codex (xhigh) | GPT-6 Sol (max) |
|---|---|---|
| BenchLeader Index | 60.0 | 67.7 |
| Agents & tools score | 65.9 | – |
| Composite score | 63.4 | 86.2 |
| Instruction following score | 75.3 | – |
| Knowledge score | 61.9 | 75.4 |
| Long context score | 67.0 | 67.7 |
| Multimodal score | 59.9 | 67.1 |
| Reasoning score | 57.0 | 95.0 |
| Blended price $/M | $4.81 | $4.00 |
| Output speed | 24 tok/s | 126 tok/s |
| Time to first answer | 3.8 s | 107.2 s |
| Context window | 400k | 1.1M |
| AA Intelligence Index | 28.5 | 47.5 |
| IFBench | 77.6% | – |
| AA-LCR | 82.3% | 83.7% |
| MMMU-Pro | 76.3% | 83.3% |
| AA-Omniscience | -2.2 | 27.1 |
| Terminal-Bench Hard | 37.1% | – |
| GPQA Diamond (AA) | 89.9% | – |
| Humanity's Last Exam (AA) | 35.7% | 47.9% |
| SciCode (AA) | – | 57.6% |
| τ²-Bench Telecom (AA) | 92.1% | – |
| CritPt | 8.7% | 30.9% |
| GDPval (AA) | – | 49.4% |
| Terminal-Bench 4.0 (AA) | – | 43.9% |
| AutomationBench | – | 61.6% |
| GDP.pdf | – | 24.8% |
| MLCR | – | 16.1% |
| AA-Omniscience: accuracy | 41.1% | 54.5% |
| AA-Omniscience: non-hallucination | 26.6% | 39.9% |
| AA-Briefcase | – | 1483 |
Data as of 2026-09-23. Best configuration of each model; every score links to its source on the model pages.
GPT-5.2-Codex vs GPT-6 Sol: questions
- Is GPT-5.2-Codex better than GPT-6 Sol?
- GPT-6 Sol (max) leads on quality: 67.7 vs 60.0. The BenchLeader Index combines every independent quality benchmark; GPT-6 Sol (max) is ahead overall as of 2026-09-23, but check the category scores for your use.
- Which is cheaper, GPT-5.2-Codex or GPT-6 Sol?
- GPT-6 Sol is cheaper: $4.00 against $4.81 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5.2-Codex or GPT-6 Sol?
- GPT-6 Sol streams faster: 126 against 24 output tokens per second.
- Which has the larger context window?
- GPT-6 Sol accepts more context: 1.1M against 400k tokens.