GPT-4.1 Mini 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 GPT-4.1 Mini and GPT-5.1 Chat.
GPT-4.1 Mini
GPT-4.1 Mini is a mid-sized model delivering performance competitive with GPT-4o at substantially lower latency and cost. It retains a 1 million token context window and scores 45.1% on hard...
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 | GPT-4.1 Mini | GPT-5.1 Chat |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Context Window | 1,047,576 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 | 2025-04-14 | 2025-11-13 |
API Pricing Comparison
Input Price per Million Tokens
GPT-4.1 Mini
$0.40
GPT-5.1 Chat
$1.25
Output Price per Million Tokens
GPT-4.1 Mini
$1.60
GPT-5.1 Chat
$10.00
Want to test both models live?
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Benchmark Performance Metrics
Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.
GPT-4.1 Mini Quirks & Gotchas
No developer gotchas reported.
GPT-5.1 Chat Quirks & Gotchas
No developer gotchas reported.