Anthropic Claude Sonnet Latest vs GPT-5.1 Chat
How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for Anthropic Claude Sonnet Latest and GPT-5.1 Chat.
Anthropic Claude Sonnet Latest
This model always redirects to the latest model in the Anthropic Claude Sonnet family.
GPT-5.1 Chat
GPT-5.1 Chat (AKA Instant is the fast, lightweight member of the 5.1 family, optimized for low-latency chat while retaining strong general intelligence. It uses adaptive reasoning to selectively “think” on...
Technical Specifications
| Specification | Anthropic Claude Sonnet Latest | GPT-5.1 Chat |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Context Window | 1,000,000 tokens | 128,000 tokens |
| Agent Suitability | N/A | N/A |
| Time to First Token (TTFT) | N/A | N/A |
| Deployment Model | managed api | managed api |
| Production Stability | beta | stable |
| API Available | Yes | Yes |
| Released Date | 2026-04-27 | 2025-11-13 |
API Pricing Comparison
Input Price per Million Tokens
Anthropic Claude Sonnet Latest
$2.00
GPT-5.1 Chat
$1.25
Output Price per Million Tokens
Anthropic Claude Sonnet Latest
$10.00
GPT-5.1 Chat
$10.00
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Run side-by-side prompt prompts in our dynamic Sandbox. Check execution speeds, latency metrics, and compute actual costs in real-time.
Benchmark Performance Metrics
Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.
Anthropic Claude Sonnet Latest Quirks & Gotchas
No developer gotchas reported.
GPT-5.1 Chat Quirks & Gotchas
No developer gotchas reported.