Claude Opus 4.6 vs GPT-5.5: Specs & Benchmark Comparison
Claude Opus 4.6 is developed by Anthropic, while GPT-5.5 comes from OpenAI. Claude Opus 4.6 was released in February 2026, and GPT-5.5 followed 2 months later in April 2026.
The two models share 16 published benchmarks. GPT-5.5 leads on 9 of them, Claude Opus 4.6 on 7. The widest gaps are on Graphwalks parents >128k, where Claude Opus 4.6 scores 95.4% against 58.5%; Terminal-Bench 2.0, where GPT-5.5 scores 82.7% against 65.4%. Averaged across everything we track, Claude Opus 4.6 sits at 74.8% and GPT-5.5 at 66.4%.
On price the two are close: Claude Opus 4.6 costs $5 per million input tokens and $25 per million output tokens, GPT-5.5 $5 and $30. Both accept a context window of about 1M tokens. Claude Opus 4.6 accepts text, images, audio, and video as input, while GPT-5.5 accepts text and images.
| Characteristic | Claude Opus 4.6 | GPT-5.5 |
|---|---|---|
| Company | Anthropic | OpenAI |
| Release Date | February 4, 2026 | April 23, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.1M |
| Context (output) | 128K | 128K |
| Input Price / 1M | $5.00 | $5.00 |
| Output Price / 1M | $25.00 | $30.00 |
| Average Score | 74.8% | 66.4% |
| Benchmarks | ||
| Graphwalks parents >128k | 95.4% | 58.5% |
| Terminal-Bench 2.0 | 65.4% | 82.7% |
| FrontierSWE | 56.0% | 73.0% |
| ARC-AGI v2 | 68.8% | 85.0% |
| Graphwalks BFS >128k | 61.5% | 45.4% |
| MCP Atlas | 62.7% | 75.3% |
| CyberGym | 73.8% | 81.8% |
| MMMU-Pro | 77.3% | 83.2% |
| LiveBench | 76.3% | 80.7% |
| GPQA | 91.3% | 93.6% |
| Legal Agent Benchmark | 4.2% | 2.1% |
| MRCR v2 (8-needle) | 76.0% | 74.0% |
| TAU2 Telecom | 99.0% | 98.0% |
| Humanity's Last Exam | 53.1% | 52.2% |
| Finance Agent | 60.7% | 60.0% |
| BrowseComp | 84.0% | 84.4% |
Visual Benchmark Comparison
Verdict
GPT-5.5 leads in 2 out of 4 comparison categories.
Both models show comparable average scores: Claude Opus 4.6 — 0.7, GPT-5.5 — 0.7.
Claude Opus 4.6 is 1.2x cheaper: input $5.00/1M vs $5.00/1M tokens.
GPT-5.5 supports a larger context: 1M vs 1M tokens.
GPT-5.5 is newer: released 4/23/2026 vs 2/4/2026.
More About These Models
Frequently Asked Questions
Which is better for coding — Claude Opus 4.6 or GPT-5.5?
Which model is cheaper — Claude Opus 4.6 or GPT-5.5?
Which has a larger context window — Claude Opus 4.6 or GPT-5.5?
The Claude Opus 4.6 and GPT-5.5 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Claude Opus 4.6 or GPT-5.5 page. See also the complete list of AI model comparisons.