GPT-5.1 Codex
Overview
Overview
GPT-5.1 Codex is a version of GPT-5.1 optimized for agentic coding tasks in Codex or similar environments. It features higher reasoning capabilities and is available in the Responses API. The underlying model snapshot is regularly updated.
GPT-5.1 Codex was released on November 19, 2025. API access is available through OpenAI.
Performance
Timeline
ReleasedUnknown
Knowledge CutoffUnknown
Specifications
Parameters
Unknown
License
Proprietary
Training Data
Unknown
Benchmarks
Benchmarks
GPT-5.1 Codex Performance Across Datasets
Scores sourced from the model's scorecard, paper, or official blog posts
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Pricing
Pricing
Pricing, performance, and capabilities for GPT-5.1 Codex across different providers:
| Provider | Input ($/M) | Output ($/M) | Max Input | Max Output | Latency (s) | Throughput | Quantization | Input | Output |
|---|---|---|---|---|---|---|---|---|---|
OpenAI | $1.25 | $10.00 | 400.0K | 128.0K | 3.0 | 50.0 c/s | — | Text Image Audio Video | Text Image Audio Video |
API Access
API Access Coming Soon
API access for GPT-5.1 Codex will be available soon through our gateway.
Recent Posts
Recent Reviews
FAQ
Common questions about GPT-5.1 Codex
GPT-5.1 Codex was released on November 19, 2025 by OpenAI.
GPT-5.1 Codex was created by OpenAI.
GPT-5.1 Codex is released under the Proprietary license.
GPT-5.1 Codex has a knowledge cutoff of September 2024. This means the model was trained on data up to this date and may not have information about events after this time.
Yes, GPT-5.1 Codex is a multimodal model that can process both text and images as input.