Claude Opus 4.8 vs GPT-5.1
Anthropic vs OpenAI — benchmarks, pricing, and capabilities side by side.
- •GPT-5.1 has the higher intelligence index (73.5 vs 73.1)
- •GPT-5.1 is cheaper ($1.25 vs $6.30 per 1M input)
- •GPT-5.1 is faster
| Claude Opus 4.8 | GPT-5.1 | |
|---|---|---|
| Intelligence index | 73.1 | 73.5 |
| Developer | Anthropic | OpenAI |
| Type | LLM | LLM |
| Access | — | API only |
| Context window | — | 400,000 tokens |
| Input price | $6.30 / 1M | $1.25 / 1M |
| Output price | $25.00 / 1M | $10.00 / 1M |
| Speed | 66 tok/s | 115 tok/s |
| Released | May 28, 2026 | November 12, 2025 |
| Parameters | — | — |
| Input modalities | — | Text, Image |
| Output modalities | — | Text |
Shared benchmarks
Claude Opus 4.8
GPT-5.1
AA-LCR
67.7
75
GPQA Diamond
92
88.1
Humanity’s Last Exam
45.7
26.5
SciCode
53.5
43.3
Terminal-Bench
58.3
45.5
τ²-bench
94.4
81.9