GPT-5.6 Sol vs o3
GPT-5.6 Sol Verdict
- GPT-5.6 Sol (high) leads on quality: 68.2 vs 60.4.
- GPT-5.6 Sol (high) is stronger in agents & tools, coding, composite, knowledge, long context, multimodal, reasoning.
- o3 is stronger in instruction following, human preference.
- o3 is 2.3× cheaper ($3.50 vs $8.00 per 1M blended).
- o3 streams 1.7× faster (101 vs 59 tokens per second).
| Metric | GPT-5.6 Sol (high) | o3 |
|---|---|---|
| BenchLeader Index | 68.2 | 60.4 |
| Agents & tools score | 87.9 | 70.3 |
| Coding score | 72.4 | 62.0 |
| Composite score | 82.7 | 54.5 |
| Instruction following score | 67.8 | 69.8 |
| Knowledge score | 73.8 | 57.9 |
| Long context score | 67.4 | 63.8 |
| Multimodal score | 66.4 | 57.9 |
| Reasoning score | 63.3 | 61.6 |
| Human preference score | – | 62.4 |
| Blended price $/M | $8.00 | $3.50 |
| Output speed | 59 tok/s | 101 tok/s |
| Time to first answer | 31.0 s | 7.7 s |
| Context window | 1M | 200k |
| SciCode | 56.9% | – |
| WeirdML | 88.8% | – |
| Epoch Capabilities Index | – | 146.9 |
| LMArena Text | – | 1431 |
| LMArena Hard Prompts | – | 1441 |
| LMArena Coding | – | 1460 |
| LMArena Vision | – | 1214 |
| AA Intelligence Index | 42.5 | 20.2 |
| IFBench | 69.2% | 71.4% |
| AA-LCR | 81.7% | 74.7% |
| MMMU-Pro | 81.8% | 70.1% |
| AA-Omniscience | 20.4 | -15.6 |
| Terminal-Bench Hard | 62.1% | 37.1% |
| GPQA Diamond (AA) | 92.8% | 82.7% |
| Humanity's Last Exam (AA) | 46.0% | 20.1% |
| SciCode (AA) | 57.8% | – |
| τ²-Bench Telecom (AA) | 83.3% | 80.7% |
| PRBench Finance | – | 47.7% |
| PRBench Legal | – | 48.6% |
| EnigmaEval | 37.1% | – |
| MMMU (validation) | – | 82.9% |
| MMMU-Pro (official) | – | 76.4% |
| Kagi LLM Benchmark | – | 67.6% |
| Aider Polyglot | – | 81.3% |
| SWE-bench Verified (bash only) | – | 58.4% |
| SWE-bench Verified (any scaffold) | – | 58.4% |
| ARC-AGI-1 | 97.0% | – |
| ARC-AGI-2 | 85.4% | – |
| ARC-AGI-3 | 2.2% | – |
| BFCL Overall | – | 63.0% |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
GPT-5.6 Sol vs o3: questions
- Is GPT-5.6 Sol better than o3?
- GPT-5.6 Sol (high) leads on quality: 68.2 vs 60.4. The BenchLeader Index combines every independent quality benchmark; GPT-5.6 Sol (high) is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is GPT-5.6 Sol better than o3 for coding?
- GPT-5.6 Sol scores higher in coding (72 vs 62 on the category index, where 50 is average).
- Is GPT-5.6 Sol better than o3 for agentic tasks?
- GPT-5.6 Sol scores higher in agentic tasks (88 vs 70 on the category index, where 50 is average).
- Which is cheaper, GPT-5.6 Sol or o3?
- o3 is cheaper: $3.50 against $8.00 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5.6 Sol or o3?
- o3 streams faster: 101 against 59 output tokens per second.
- Which has the larger context window?
- GPT-5.6 Sol accepts more context: 1M against 200k tokens.