GPT-5.6 API Pricing
As of October 10, 2026, GPT-5.6 costs $4.00 per 1M input tokens and $20.00 per 1M output tokens on OpenAI, with cache reads at $0.40 and cache writes at $5.00 per 1M tokens. It has a 922,000-token context window and returns up to 128,000 tokens per response.
- Input
- $4.00 / 1M tokens
- Output
- $20.00 / 1M tokens
- Cache read
- $0.40 / 1M tokens
- Context window
- 922,000 tokens
- Max output
- 128,000 tokens
- Providers
- 2
- Added to LiteLLM
- July 9, 2026
GPT-5.6 pricing by provider
4 listings across 2 providers. Token prices are in US dollars per 1M tokens. The highlighted row is the price quoted above.
| Provider | Model name in LiteLLM | Input | Output | Cache read | Cache write | Batch in | Batch out | Context |
|---|---|---|---|---|---|---|---|---|
| OpenAI | gpt-5.6 | $4.00 | $20.00 | $0.40 | $5.00 | $2.00 | $10.00 | 922K |
| Azure OpenAI | azure/gpt-5.6 | $4.00 | $20.00 | $0.40 | $5.00 | – | – | 922K |
| Azure OpenAIeu | azure/eu/gpt-5.6 | $4.40 | $22.00 | $0.44 | $5.50 | – | – | 922K |
| Azure OpenAIus | azure/us/gpt-5.6 | $4.40 | $22.00 | $0.44 | $5.50 | – | – | 922K |
Other GPT-5.6 prices on OpenAI
| Priority input | $8.00 per 1M tokens |
| Priority output | $40.00 per 1M tokens |
| Flex input | $2.00 per 1M tokens |
| Flex output | $10.00 per 1M tokens |
| Input above 272K tokens | $8.00 per 1M tokens |
| Output above 272K tokens | $30.00 per 1M tokens |
| Cache read above 272K tokens | $0.80 per 1M tokens |
| Web search | $10.00 per 1K searches |
What GPT-5.6 costs in practice
1,000 requests with 2,000 input and 500 output tokens each
| OpenAI | $18.00 |
| Azure OpenAI | $18.00 |
| OpenAI batch | $9.00 |
100 long-document requests with 100,000 input and 2,000 output tokens each
| OpenAI | $44.00 |
| Azure OpenAI | $44.00 |
GPT-5.6 features
Input: text, image. Output: text.
- Function calling
- Parallel tool calls
- Structured output
- Image input
- PDF input
- Reasoning
- Prompt caching
- Web search
Use GPT-5.6 with LiteLLM
Call GPT-5.6 through the LiteLLM Python SDK, or put it behind the LiteLLM proxy and send OpenAI-format requests to /v1/chat/completions. LiteLLM tracks the cost of every request at these prices.
from litellm import completion
response = completion(
model="gpt-5.6",
messages=[{"role": "user", "content": "Hello!"}],
)model_list:
- model_name: gpt-5.6
litellm_params:
model: gpt-5.6
api_key: os.environ/OPENAI_API_KEYcurl http://0.0.0.0:4000/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer sk-1234" \
-d '{
"model": "gpt-5.6",
"messages": [{"role": "user", "content": "Hello!"}]
}'GPT-5.6 FAQ
How much does GPT-5.6 cost?
GPT-5.6 costs $4.00 per 1M input tokens and $20.00 per 1M output tokens on OpenAI, with cache reads at $0.40 and cache writes at $5.00 per 1M tokens. Batch requests cost $2.00 per 1M input tokens and $10.00 per 1M output tokens. Above 272K input tokens, input costs $8.00 and output costs $30.00 per 1M tokens.
What is the context window of GPT-5.6?
GPT-5.6 has a 922,000-token context window and returns up to 128,000 tokens per response.
Which providers offer GPT-5.6?
GPT-5.6 is available from 2 providers through LiteLLM: OpenAI and Azure OpenAI.
How do I call GPT-5.6 with an OpenAI-compatible API?
Use the LiteLLM Python SDK with model="gpt-5.6", or add the model to the LiteLLM proxy's config.yaml and send requests to /v1/chat/completions from any OpenAI client. LiteLLM tracks the cost of every request at the prices on this page.
What features does GPT-5.6 support?
GPT-5.6 supports function calling, parallel tool calls, structured output, image input, PDF input, reasoning, prompt caching and web search.
When did LiteLLM add GPT-5.6?
GPT-5.6 was added to LiteLLM's model price file on July 9, 2026.
Sources
Prices come from LiteLLM's open-source model_prices_and_context_window.json, which LiteLLM uses to calculate the cost of every request.
LiteLLM docs: OpenAI, Azure OpenAI.
Provider pages: OpenAI, Azure OpenAI.