Model Details
Released
Nov 13, 2025
Status
Deprecated(on Jul 23, 2026)
Context Length
400,000
Max Output
128,000
Superseded By
Where is GPT-5.1 Codex a perfect fit?
Where is GPT-5.1 Codex a perfect fit?
- Long-running, autonomous coding agents and workflows
- Continuous code review and refactoring in large repositories
- Automated test generation, CI/CD integration, and pull-request suggestions
- Interactive development in terminal or IDE via Codex CLI or extension
- Coding tasks where the model needs to think deeply, plan, and iterate over hours
- Long-running, autonomous coding agents and workflows
- Continuous code review and refactoring in large repositories
- Automated test generation, CI/CD integration, and pull-request suggestions
- Interactive development in terminal or IDE via Codex CLI or extension
- Coding tasks where the model needs to think deeply, plan, and iterate over hours
Quick Model Estimate
Your GPT-5.1 Codex Cost Estimate
💰 Total Cost
—
for 1000 input + 1000 output tokens
📥 Input (1000 × $1.250000)
—
📤 Output (1000 × $10.000000)
—
Cost Breakdown
📥 Input
📤 Output
At the last price OpenAI charged, before it stopped on 23rd Jul 2026. No longer on offer.
Pricing
No provider we track currently offers GPT-5.1 Codex.
No longer offered by
The last prices each provider charged for GPT-5.1 Codex before it stopped offering it. These are no longer on offer. Each row links to that provider's price history.
|
Provider
↕
|
Ended
↕
|
Modality
↕
|
Service Tier
↕
|
Input Price
(per 1M tokens) ↕ |
Output Price
(per 1M tokens) ↕ |
Cached Input
(per 1M tokens) ↕ |
Context Size
↕
|
View
|
|---|---|---|---|---|---|---|---|---|
 OpenAI | 23rd Jul 2026Model retired | Text | Standard | $1.2500 | $10.0000 | $0.1250 | 400,000 tokens | → |
| OpenAI | 23rd Jul 2026Model retired | Text | Priority | $2.5000 | $20.0000 | $0.2500 | 400,000 tokens | → |
Recent changes
When GPT-5.1 Codex was newly listed on a provider, moved to legacy or deprecated, or retired.
-
Retired
OpenAI retired GPT-5.1 Codex, with GPT-5.6 Sol as the suggested replacement.
Other Models in the GPT-5.1 Family
FAQs about GPT-5.1 Codex
What is GPT-5.1 Codex's context window?
GPT-5.1 Codex has a context window of 400,000 tokens, and returns up to 128,000 tokens in a single response.
Is GPT-5.1 Codex still available?
GPT-5.1 Codex is deprecated and was retired on 23 July 2026. The replacement is GPT-5.6 Sol.