Claude 3.5 Sonnet vs GPT-5.1 Thinking: Specs & Benchmark Comparison
| Characteristic | Claude 3.5 Sonnet | GPT-5.1 Thinking |
|---|---|---|
| Company | Anthropic | OpenAI |
| Release Date | June 21, 2024 | November 11, 2025 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 200K | 256K |
| Context (output) | 200K | 128K |
| Input Price / 1M | $3.00 | $3.00 |
| Output Price / 1M | $15.00 | $12.00 |
| Average Score | 0.8 | 0.9 |
| Benchmarks | ||
| GPQA | 0.6 | 0.9 |
Visual Benchmark Comparison
Claude 3.5 Sonnet
GPT-5.1 Thinking
GPQA0.6 vs 0.9
0.6
0.9
Verdict
GPT-5.1 Thinking leads in 3 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: Claude 3.5 Sonnet — 0.8, GPT-5.1 Thinking — 0.9.
API Cost
GPT-5.1 Thinking is 1.2x cheaper: input $3.00/1M vs $3.00/1M tokens.
Context Window
GPT-5.1 Thinking supports a larger context: 256K vs 200K tokens.
Recency
GPT-5.1 Thinking is newer: released 11/11/2025 vs 6/21/2024.
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Frequently Asked Questions
Which is better for coding — Claude 3.5 Sonnet or GPT-5.1 Thinking?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — Claude 3.5 Sonnet or GPT-5.1 Thinking?
Claude 3.5 Sonnet is cheaper for input: $3.00 per 1M tokens vs $3.00.
Which has a larger context window — Claude 3.5 Sonnet or GPT-5.1 Thinking?
GPT-5.1 Thinking supports a larger context: 256,000 tokens vs 200,000.
The Claude 3.5 Sonnet and GPT-5.1 Thinking comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Claude 3.5 Sonnet or GPT-5.1 Thinking page. See also the complete list of AI model comparisons.