Loading benchmark catalogue
Compare performance benchmarks, coding intelligence, reasoning evaluations, context limits, and API economics between Claude Sonnet 5.5 (Anthropic) and GPT-6.1 Sol (OpenAI).
| Metric / Capability | Claude Sonnet 5.5 | GPT-6.1 Sol |
|---|---|---|
| Developer / Organization | Anthropic | OpenAI |
| Release Date | 2026-09-28 | 2026-09-29 |
| Deployment / Weights | Proprietary Cloud API | Proprietary Cloud API |
| Context Window | 1M tokens (1,000,000 tokens) | 1.1M tokens (1,050,000 tokens) |
| Input Pricing (/1M Tokens) | $2 | $2 |
| Output Pricing (/1M Tokens) | $10 | $10 |
| Benchmark / Domain | Claude Sonnet 5.5 | GPT-6.1 Sol | Advantage |
|---|---|---|---|
Artificial Analysis Intelligence Index Composite index aggregating 10+ evaluations of general reasoning and knowledge. | 56.0% | 51.8% | Claude Sonnet 5.5 (+8%) |
Artificial Analysis Coding Agent Index v2.0 Composite index of coding-agent systems (model + harness) across FrontierCode v1.1, SWE-Atlas-QnA, and Terminal-Bench v4. | 59.3% | 54.1% | Claude Sonnet 5.5 (+10%) |
SWE-bench Pro Harder, contamination-resistant successor to SWE-bench spanning multiple languages. | 81.3% | — | — |
Terminal-Bench 4.0 Sandboxed command-line tasks requiring shell and file-system operation. | 70.6% | 58.2% | Claude Sonnet 5.5 (+21%) |
ARC-AGI-2 Novel visual grid puzzles requiring abstract rule induction. | 83.9% | 94.2% | GPT-6.1 Sol (+12%) |
Humanity's Last Exam Expert-written questions across hundreds of disciplines designed to resist saturation. | 56.9% | — | — |
FrontierMath v2 (Tiers 1-3) Unpublished, research-level mathematics problems across Tiers 1-3. | 88.8% | 93.7% | GPT-6.1 Sol (+6%) |
Design Arena ELO Human-preference ELO across UI, 3D, data-visualization, and game-dev generations. | 1413 | 1437 | GPT-6.1 Sol (+2%) |
Both models perform neck-and-neck across available benchmarks, with Claude Sonnet 5.5 and GPT-6.1 Sol each excelling in distinct tasks.
GPT-6.1 Sol has the larger context capacity of 1.1M tokens (1,050,000 tokens), compared to 1M tokens for Claude Sonnet 5.5.
Both models have comparable pricing structures or open weight deployment options.
Claude Sonnet 5.5 is a proprietary cloud API. GPT-6.1 Sol is a proprietary cloud API.
Analyze 130+ models side-by-side using interactive radar charts, cost-efficiency quadrant plots, and live dataset filters on the full NeuBench index.
Open Interactive Comparator