Claude Sonnet 5.5 vs GPT-5.2
Claude Sonnet 5.5 
GPT-5.2 Verdict
- Claude Sonnet 5.5 (max) leads on quality: 67.6 vs 60.8.
- Claude Sonnet 5.5 (max) is stronger in agents & tools, coding, composite, knowledge, maths, reasoning.
- GPT-5.2 (xhigh) is stronger in instruction following.
- Claude Sonnet 5.5 (max) is 1.2× cheaper ($4.00 vs $4.81 per 1M blended).
- Claude Sonnet 5.5 (max) streams 1.7× faster (141 vs 81 tokens per second).
| Metric | Claude Sonnet 5.5 (max) | GPT-5.2 (xhigh) |
|---|---|---|
| BenchLeader Index | 67.6 | 60.8 |
| Agents & tools score | 69.5 | 54.8 |
| Coding score | 69.8 | 62.9 |
| Composite score | 72.6 | 64.0 |
| Knowledge score | 65.4 | 57.3 |
| Long context score | 66.6 | 66.6 |
| Maths score | 72.9 | 57.2 |
| Reasoning score | 81.1 | 60.8 |
| Instruction following score | – | 73.4 |
| Blended price $/M | $4.00 | $4.81 |
| Output speed | 141 tok/s | 81 tok/s |
| Time to first answer | 487.1 s | 156.9 s |
| Context window | 1M | 128k |
| GPQA Diamond | 95.6% | 91.4% |
| FrontierMath Tiers 1–3 | 88.8% | 67.4% |
| FrontierMath Tier 4 | 80.5% | 31.7% |
| OTIS Mock AIME | 100.0% | 96.1% |
| SimpleQA Verified | 46.5% | 37.1% |
| Terminal-Bench | 61.8% | – |
| SciCode | 61.0% | – |
| WeirdML | – | 72.2% |
| APEX-Agents | 75.5% | – |
| ProofBench | 100.0% | 15.0% |
| LMArena Agent | 12 | – |
| LiveBench | 75.7% | – |
| LiveBench Reasoning | 91.6% | – |
| LiveBench Coding | 91.4% | – |
| LiveBench Agentic Coding | 56.3% | – |
| LiveBench Mathematics | 96.1% | – |
| LiveBench Data Analysis | 59.5% | – |
| LiveBench Language | 78.0% | – |
| LiveBench Instruction Following | 56.8% | – |
| AA Intelligence Index v4.3.2 | 56 | 30.4 |
| IFBench | – | 75.4% |
| AA-LCR | 82.7% | 82.7% |
| AA-Omniscience | 32.3 | -0.9 |
| Terminal-Bench Hard | – | 47.0% |
| GPQA Diamond (AA) | – | 90.3% |
| Humanity's Last Exam (AA) | 55.0% | 37.7% |
| SciCode (AA) | 61.0% | – |
| τ²-Bench Telecom (AA) | – | 84.8% |
| AIME (Vals) | – | 96.9% |
| LiveCodeBench | – | 85.4% |
| MMLU-Pro | – | 86.2% |
| LegalBench | – | 82.8% |
| CorpFin | – | 65.9% |
| TaxEval | – | 75.8% |
| MedQA | – | 94.1% |
| MGSM | – | 94.0% |
| SWE-bench (Vals) | – | 75.8% |
| GPQA Diamond (Vals) | – | 91.7% |
| MCP Atlas | – | 67.6% |
| ARC-AGI-1 | – | 86.2% |
| ARC-AGI-2 | – | 52.9% |
| CritPt | 31.4% | 11.6% |
| GDPval-AA v2.1 | 67.0% | – |
| Analyst Agent (AA) | 57.5% | – |
| CaseLaw v2 | – | 66.0% |
| MedCode | – | 49.8% |
| MedScribe | – | 84.4% |
| MMMU-Pro (Vals) | – | 86.7% |
| MortgageTax | – | 67.1% |
| SAGE | – | 49.3% |
| Vibe Code Bench v1.1 | – | 53.5% |
| Chess Puzzles | – | 49.0% |
| EBR-bench | – | 23.0% |
| Mystery Game Puzzles | 65.0% | – |
| VPCT | – | 84.0% |
| LMCA | – | 43.9% |
| DTBench | – | 90.9% |
| CursorBench | 55.5% | – |
| FrontierSWE | 61.9% | – |
| Terminal-Bench 4.0 (AA) | 63.6% | – |
| AutomationBench | 71.8% | – |
| GDP.pdf | 25.8% | – |
| MLCR | 75.0% | – |
| Harvey LAB | 2.8% | – |
| AA-Omniscience: accuracy | 54.0% | 44.3% |
| AA-Omniscience: non-hallucination | 53.0% | 18.8% |
| AA-Briefcase v1.1 | 1823 | – |
Data as of 2026-10-11. Best configuration of each model; every score links to its source on the model pages.
Claude Sonnet 5.5 vs GPT-5.2: questions
- Is Claude Sonnet 5.5 better than GPT-5.2?
- Claude Sonnet 5.5 (max) leads on quality: 67.6 vs 60.8. The BenchLeader Index combines every independent quality benchmark; Claude Sonnet 5.5 (max) is ahead overall as of 2026-10-11, but check the category scores for your use.
- Is Claude Sonnet 5.5 better than GPT-5.2 for coding?
- Claude Sonnet 5.5 scores higher in coding (70 vs 63 on the category index, where 50 is average).
- Is Claude Sonnet 5.5 better than GPT-5.2 for agentic tasks?
- Claude Sonnet 5.5 scores higher in agentic tasks (70 vs 55 on the category index, where 50 is average).
- Which is cheaper, Claude Sonnet 5.5 or GPT-5.2?
- Claude Sonnet 5.5 is cheaper: $4.00 against $4.81 per million tokens, blended at three input tokens per output token.
- Which is faster, Claude Sonnet 5.5 or GPT-5.2?
- Claude Sonnet 5.5 streams faster: 141 against 81 output tokens per second.
- Which has the larger context window?
- Claude Sonnet 5.5 accepts more context: 1M against 128k tokens.