GPT-5.1 Codex Max Pricing - Cost Calculator

Track gpt-5.1-codex-max pricing with real-time alerts, compare providers, and monitor cost changes across long-running autonomous coding workflows.

GPT-5.1 Codex Max, a coding model from OpenAI released 19 November 2025, has been deprecated. It was replaced by GPT-5.6 Sol on 23 July 2026. A 400,000-token context window feeds responses of up to 128,000 tokens. It costs between $1.25 and $2.50 per million input tokens, depending on service tier.

Last updated Sep 27, 2026

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Model Details

Released
Nov 19, 2025
Status
Deprecated(on Jul 23, 2026)
Context Length
400,000
Max Output
128,000
Superseded By
GPT-5.6 Sol

Where is GPT-5.1 Codex Max a perfect fit?

gpt-5.1-codex-max is built for long-horizon, autonomous coding workflows where models need to think, act, and iterate over extended periods. Ideal for:
- Multi-hour or continuous coding agents handling large projects
- Full-repo refactoring, debugging, and test-driven development
- Autonomous PR creation, review, and iteration loops
- Complex engineering workflows involving multiple tools and environments
- Large-scale system design and cross-file reasoning
- Async development (define task → model executes over hours)

Quick Model Estimate

(USD 1.2500 per 1M tokens)
(USD 10.0000 per 1M tokens)

Your GPT-5.1 Codex Max Cost Estimate

💰 Total Cost

—

for 1000 input + 1000 output tokens

📥 Input (1000 × $1.250000) —
📤 Output (1000 × $10.000000) —

Cost Breakdown

📥 Input 📤 Output

Prices are watched for changes and checked against the provider's own page.

Pricing

Provider ↕
Modality ↕
Service Tier ↕
Input Price
(per 1M tokens) ↕
Output Price
(per 1M tokens) ↕
Cached Input
(per 1M tokens) ↕
Context Size ↕
View
OpenAI LogoOpenAITextStandard$1.2500$10.0000$0.1250400,000 tokens→
OpenAI LogoOpenAITextPriority$2.5000$20.0000$0.2500400,000 tokens→

Other Models in the GPT-5.1 Family

GPT-5.1

Active

Multimodal · 400,000 context

GPT-5.1 Chat Latest

Deprecated

Chat · 128,000 context

GPT-5.1 Codex

Deprecated

Code · 400,000 context

GPT-5.1 Codex Mini

Deprecated

Code · 400,000 context

FAQs about GPT-5.1 Codex Max

How much does GPT-5.1 Codex Max cost per 1M tokens?

GPT-5.1 Codex Max costs between $1.25 and $2.50 per million input tokens, and between $10.00 and $20.00 per million output tokens. The range covers Standard and Priority pricing.

What does a typical workload cost with GPT-5.1 Codex Max?

1,000 requests of 2,000 input and 500 output tokens each — 2,000,000 input and 500,000 output tokens in total — costs $7.50 with GPT-5.1 Codex Max at its lowest rates. Use the calculator on this page for your own volumes.

Where can I use GPT-5.1 Codex Max?

GPT-5.1 Codex Max is available through OpenAI, from $1.25 per million input tokens.

What is GPT-5.1 Codex Max's context window?

GPT-5.1 Codex Max has a context window of 400,000 tokens, and returns up to 128,000 tokens in a single response.

Is GPT-5.1 Codex Max still available?

GPT-5.1 Codex Max is deprecated and was retired on 23 July 2026. The replacement is GPT-5.6 Sol.