GPT-5.6 Luna
openai/gpt-5.6-lunaOpenAI~openai/gpt-luna-latestoperationalGPT-5.6 model optimised for cost-sensitive, high-volume workloads.
Official pricing
USD per million tokens, exactly what OpenAI publishes. ElevenRouter adds no markup on tokens.
Example: 1,000 input + 500 output tokens ≈ $0.00080. Zero-completion responses are never charged.
Specs
- Context
- 400K
- Max output
- 128K
- Modalities
- text+image+file->text
- Tokenizer
- GPT
- Released
- 2026-09-20
- Family
- gpt-luna
Availability on ElevenRouter
Measured by the routing engine; up when at least one credential can serve the model.
Observed performance
Real requests over the last 7 days (20 samples).
- Time to first token p50
- 6.41s
- p95
- 18.24s
- Output tokens/s p50
- 11
- p95
- 18
Usage on ElevenRouter
Tokens per day across all customers (anonymous, aggregate).
Use it
Any OpenAI or Anthropic SDK works by changing the base URL. Supported parameters: max_tokens, temperature, top_p, frequency_penalty, presence_penalty, seed, stop, tools, tool_choice, parallel_tool_calls, response_format, structured_outputs, logit_bias, logprobs, top_logprobs, reasoning, include_reasoning, verbosity.
curl https://elevenrouter.com/api/v1/chat/completions \
-H "Authorization: Bearer $ELEVENROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{ "model": "openai/gpt-5.6-luna", "messages": [{ "role": "user", "content": "Hello" }] }'Related models
- GPT-5.6 Terra · OpenAI$2.00 / $12.00
- GPT-5.6 Sol · OpenAI$4.00 / $20.00
- GPT-6 Astra · OpenAI$10.00 / $50.00
- DeepSeek V4.1 Flash · DeepSeek$0.300 / $1.20
- DeepSeek V4 Flash · DeepSeek$0.440 / $1.32
- Hunyuan Hy3 · Tencent$0.132 / $0.528
- GLM 5.3 Flash · Z.AI$0.150 / $0.500
- DeepSeek V4 Pro · DeepSeek$1.32 / $3.96
- Claude Haiku 4.5 · Anthropic$1.00 / $5.00
Frequently asked questions
How much does GPT-5.6 Luna cost on ElevenRouter?
GPT-5.6 Luna is billed at OpenAI's official list price: $0.200 per million input tokens and $1.20 per million output tokens, with cached input at $0.020. A request with 1,000 input and 500 output tokens costs about $0.00080.
What is the context length of GPT-5.6 Luna?
GPT-5.6 Luna accepts up to 400K tokens of context and can produce up to 128K output tokens.
Does GPT-5.6 Luna support tool calling and structured outputs?
Yes, tool calling is supported and JSON-schema structured outputs are native. Supported parameters: max_tokens, temperature, top_p, frequency_penalty, presence_penalty, seed, stop, tools, tool_choice, parallel_tool_calls, response_format, structured_outputs, logit_bias, logprobs, top_logprobs, reasoning, include_reasoning, verbosity.
How do I call GPT-5.6 Luna?
Send an OpenAI-compatible chat completion to https://elevenrouter.com/api/v1/chat/completions with "model": "openai/gpt-5.6-luna" and your ElevenRouter key, or use the Anthropic Messages endpoint. Any OpenAI or Anthropic SDK works by changing the base URL.
Is GPT-5.6 Luna available right now?
Availability is measured continuously by the routing engine. Current status: operational, 100.00% uptime over the last 30 days. When one credential fails, requests fail over to another automatically.