GPT 5.1 Codex Max pricing
$$$ Premium$1.25/M input · $10.00/M output. List prices from provider data; in idapt, chat is metered per token with transparent, usage-based pricing at the prices shown in the app.
Full rate table
| Rate | Price | Unit |
|---|---|---|
| Input | 1.25 | /M tokens |
| Output | 10 | /M tokens |
| Cache read | 0.125 | /M tokens |
| Web search | 0.01 | /search |
What typical work costs
| Workload | Tokens | List price |
|---|---|---|
| Quick question | 1K tokens in, 500 out | $0.0063 |
| Long-document summary | 60K tokens in, 2K out | $0.10 |
| Agent working session | 400K tokens in, 40K out across a day | $0.90 |
Price your own workload
- Per call
- $0.0063
- Per month
- $0.63
Compare up to four models at once in the cost calculator.
Frequently asked
What does GPT 5.1 Codex Max cost per 1M tokens?
GPT 5.1 Codex Max lists at $1.25 per 1M input tokens and $10.00 per 1M output tokens.
Does GPT 5.1 Codex Max discount cached input tokens?
Yes. Cached input tokens are billed at $0.13 per 1M, versus $1.25 for fresh input. Prompts that repeat a long prefix (a system prompt, attached files) benefit the most.
What does a typical chat message with GPT 5.1 Codex Max cost?
A message with about 1,000 input tokens and a 500-token reply costs roughly $0.0063 at list price. Long documents and long replies scale that linearly with token counts.
Is GPT 5.1 Codex Max cheaper than GPT 5.1?
GPT 5.1 Codex Max has the lower blended price at a 3:1 input:output mix. GPT 5.1 Codex Max: $1.25 in / $10.00 out per 1M. GPT 5.1: $1.25 in / $10.00 out per 1M.
How does idapt bill GPT 5.1 Codex Max?
Chat with GPT 5.1 Codex Max in idapt is metered per token with transparent, usage-based pricing at the prices shown in the app. Subscriptions include a weekly usage allowance before any balance is touched.
Part of the GPT 5.1 Codex Max model page · cheapest models board · price changes