GPT-5.6 API Pricing
OpenAI · released Jul 9, 2026 · 1.05M context · API model ID gpt-5.6
GPT-5.6 by OpenAI API pricing: $4.00 per 1M input tokens and $20.00 per 1M output tokens (provider list price via models.dev, Oct 10, 2026).
Prices
| Price | USD per 1M tokens |
|---|---|
| Input | $4.00 |
| Output | $20.00 |
| Cache read | $0.40 |
| Cache write | $5.00 |
OpenAI's list price for its own API, as compiled by models.dev and checked Oct 10, 2026, 09:00 UTC. Prices on cloud platforms and resellers can differ. Provider documentation
Estimated monthly cost
$4,200
per month
- per day
- $140.00
- per request
- $0.014
Cannot estimate: a needed price is not published.
Cost = input tokens × input price + output tokens × output price, 30 days a month. Cached input uses the cache read price. Cache write fees are not included.
Long-context prices
Prompts longer than the threshold are billed at a higher rate.
| Prompts over | Input | Output | Cache read | Cache write |
|---|---|---|---|---|
| 272,000 tokens | $8.00 | $30.00 | $0.80 | $10.00 |
Monthly cost by workload
| Workload | Per month |
|---|---|
| Chatbot1,000 in / 500 out tokens, 10,000 requests a day | $4,200/mo |
| RAG8,000 in / 500 out tokens, 5,000 requests a day | $6,300/mo |
| Coding agent50,000 in / 2,000 out tokens, 1,000 requests a day, 80% cached input | $2,880/mo |
Context and capabilities
- Context
- 1,050,000 tokens
- Max output
- 128,000 tokens
- Input
- text, image, pdf
- Output
- text
- Knowledge cutoff
- Feb 16, 2026
- Open weights
- No
- Tool calling
- Yes
- Reasoning
- Yes
- Structured outputs
- Yes
Capabilities and limits as listed by models.dev.
Similarly priced models
- Claude Opus 5.5 · $4.00 in / $20.00 out
- Kimi K3 · $3.00 in / $15.00 out
- Gemini 3.1 Pro Preview · $2.00 in / $12.00 out
- Claude Sonnet 5.5 · $2.00 in / $10.00 out
Price history
No price changes since we started tracking on Oct 8, 2026.
Questions
- How much does GPT-5.6 cost per month?
- For a chatbot handling 10,000 requests a day with 1,000 input and 500 output tokens each, GPT-5.6 costs about $4,200 per month at OpenAI's list prices ($4.00 per 1M input tokens, $20.00 per 1M output tokens).
- Does GPT-5.6 support prompt caching?
- Yes. Cached input costs $0.40 per 1M tokens, compared with $4.00 for regular input. Writing to the cache costs $5.00 per 1M tokens.
- How long is GPT-5.6's context window?
- GPT-5.6 accepts up to 1,050,000 tokens (1.05M) of context and returns up to 128,000 tokens per response.