Model comparison
Claude Opus 4.7 vs GPT-5.5 Instant
Claude Opus 4.7 is the stronger model overall, scoring 58.3 to 42.7 on the Noometry Index.
Last verified . 27 shared benchmarks.
Summary
- They share 27 benchmarks with published results for both. Claude Opus 4.7 scores higher in 9 categories and GPT-5.5 Instant in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Opus 4.7 leads 66.7 to 26.5.
- The biggest single-benchmark swing is FrontierMath (Tiers 1-3): 70.2% for Claude Opus 4.7 and 26.3% for GPT-5.5 Instant.
Side by side
| Claude Opus 4.7 | GPT-5.5 Instant | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 58.3 | 42.7 |
| Released | 2026-04-14 | 2026-05-05 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $5 | — |
| Output $ / M tokens | $25 | — |
| Results tracked | 66 | 27 |
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Category by category
Coding Claude Opus 4.7 leads
Claude Opus 4.7: 59.6 (#13), GPT-5.5 Instant: 44.3 (#74)
| Benchmark | Claude Opus 4.7 | GPT-5.5 Instant |
|---|---|---|
| SciCode | 54.5% | 48.6% |
| LMArena Coding | 1518 | 1433 |
| SWE-bench Verified | 83.5% | — |
| FrontierCode | 38.5% | — |
| LMArena WebDev | 1558 | — |
| GSO | 44.1% | — |
| WeirdML | 76.4% | — |
| MirrorCode | 31.1% | — |
| ALE-Bench | 1,323 | — |
Agentic & Tool Use Not comparable
Claude Opus 4.7: 47.9 (#10), GPT-5.5 Instant: —
| Benchmark | Claude Opus 4.7 | GPT-5.5 Instant |
|---|---|---|
| Terminal-Bench | 80.2% | — |
| APEX-Agents | 49.2% | — |
| OSWorld 2.0 | 18.2% | — |
| τ²-bench Banking | 40.2% | — |
| PostTrainBench | 28.6% | — |
| ExploitBench | 26.5% | — |
| GBAEval | 43.8% | — |
| GDP.pdf | 21% | — |
| LMArena Search | 1233 | — |
| Vending-Bench 2 | 10,937 | — |
Reasoning Claude Opus 4.7 leads
Claude Opus 4.7: 53.8 (#29), GPT-5.5 Instant: 24.9 (#155)
| Benchmark | Claude Opus 4.7 | GPT-5.5 Instant |
|---|---|---|
| CritPt | 12% | 0% |
| Chess Puzzles | 30% | 12% |
| LMArena Hard Prompts | 1506 | 1426 |
| Epoch Capabilities Index | 156.25 | 142.52 |
| ARC-AGI-2 | 75.8% | — |
| SimpleBench | 61.7% | — |
| Kagi LLM Benchmark | 80.7% | — |
| NYT Connections (extended) | 39% | — |
| ARC-AGI-1 | 93.5% | — |
| Thematic Generalization | 72.8% | — |
| EBR-Bench | 19% | — |
| Mystery Game Puzzles | 28% | — |
| DTBench | 94.7% | — |
| LMCA | 52.2% | — |
| ForecastBench | 60.3 | — |
Math Claude Opus 4.7 leads
Claude Opus 4.7: 66.7 (#26), GPT-5.5 Instant: 26.5 (#259)
| Benchmark | Claude Opus 4.7 | GPT-5.5 Instant |
|---|---|---|
| FrontierMath (Tiers 1-3) | 70.2% | 26.3% |
| FrontierMath Tier 4 | 31.7% | 2.4% |
| OTIS Mock AIME 2024-2025 | 97.8% | 68.1% |
| LMArena Math | 1499 | 1420 |
| MathArena Final-Answer Competitions | 73.6% | — |
| ProofBench | 54% | — |
| FrontierMath (Feb 2025 set) | 43.8% | — |
| FrontierMath Tier 4 (v1) | 22.9% | — |
Knowledge Claude Opus 4.7 leads
Claude Opus 4.7: 62.6 (#23), GPT-5.5 Instant: 48.9 (#74)
| Benchmark | Claude Opus 4.7 | GPT-5.5 Instant |
|---|---|---|
| GPQA Diamond | 90.2% | 82.5% |
| LMArena Expert | 1521 | 1409 |
| Humanity's Last Exam | 36.2% | — |
| SimpleQA Verified | 51.7% | — |
| Vectara Hallucination Rate | 12% | — |
Multimodal Claude Opus 4.7 leads
Claude Opus 4.7: 41.2 (#38), GPT-5.5 Instant: 40.0 (#52)
| Benchmark | Claude Opus 4.7 | GPT-5.5 Instant |
|---|---|---|
| LMArena Vision | 1316 | 1250 |
| LMArena Document | 1495 | 1403 |
| Blueprint-Bench 2 | 24.5% | — |
| Furniture Assembly | 33.3% | — |
Multilingual Claude Opus 4.7 leads
Claude Opus 4.7: 57.3 (#10), GPT-5.5 Instant: 52.8 (#80)
| Benchmark | Claude Opus 4.7 | GPT-5.5 Instant |
|---|---|---|
| LMArena Non-English | 1480 | 1417 |
| LMArena Chinese | 1531 | 1456 |
| LMArena French | 1503 | 1428 |
| LMArena German | 1495 | 1411 |
| LMArena Japanese | 1472 | 1408 |
| LMArena Korean | 1464 | 1392 |
| LMArena Russian | 1494 | 1431 |
| LMArena Spanish | 1495 | 1429 |
Instruction Following Claude Opus 4.7 leads
Claude Opus 4.7: 78.4 (#10), GPT-5.5 Instant: 74.2 (#100)
| Benchmark | Claude Opus 4.7 | GPT-5.5 Instant |
|---|---|---|
| LMArena Instruction Following | 1498 | 1406 |
Long Context Claude Opus 4.7 leads
Claude Opus 4.7: 46.2 (#25), GPT-5.5 Instant: 43.4 (#96)
| Benchmark | Claude Opus 4.7 | GPT-5.5 Instant |
|---|---|---|
| LMArena Longer Query | 1505 | 1422 |
Writing & Preference Claude Opus 4.7 leads
Claude Opus 4.7: 75.1 (#8), GPT-5.5 Instant: 61.8 (#85)
| Benchmark | Claude Opus 4.7 | GPT-5.5 Instant |
|---|---|---|
| LMArena Text | 1490 | 1419 |
| LMArena Creative Writing | 1486 | 1419 |
| LMArena Multi-Turn | 1505 | 1433 |
| EQ-Bench Creative Writing | 1914 | — |
| EQ-Bench 4 | 1311 | — |
Frequently asked questions
Is Claude Opus 4.7 better than GPT-5.5 Instant?
Claude Opus 4.7 is the stronger model overall, scoring 58.3 to 42.7 on the Noometry Index.
Is Claude Opus 4.7 or GPT-5.5 Instant better for coding?
Claude Opus 4.7 scores higher on coding benchmarks: 59.6 versus 44.3 in the Noometry coding category.
How many benchmarks do Claude Opus 4.7 and GPT-5.5 Instant share?
27 benchmarks have published results for both models. Claude Opus 4.7 has 66 scored results on Noometry and GPT-5.5 Instant has 27.