--- description: GPT-5.6 Luna is an OpenAI GPT-5.6 model optimized for cost-sensitive workloads, using the Responses API for efficient text generation. title: GPT-5.6 Luna image: https://developers.cloudflare.com/og-docs.png --- [Skip to content](#main-content) > Documentation Index > Fetch the complete documentation index at: https://developers.cloudflare.com/llms.txt > Use this file to discover all available pages before exploring further. ![OpenAI logo](https://developers.cloudflare.com/_astro/openai.BBwNKzBb.svg) # GPT-5.6 Luna Text Generation • OpenAI Copy as Markdown|[View as Markdown](https://developers.cloudflare.com/ai/models/openai/gpt-5.6-luna/index.md)|[Agent setup](https://developers.cloudflare.com/agent-setup/) `openai/gpt-5.6-luna` * Third-party GPT-5.6 Luna is an OpenAI GPT-5.6 model optimized for cost-sensitive workloads, using the Responses API for efficient text generation. | Model Info | | | ----------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------- | | Context Window[ ↗](https://developers.cloudflare.com/workers-ai/platform/glossary/) | 1,050,000 tokens | | Terms and License | [link ↗](https://openai.com/policies/) | | More information | [link ↗](https://openai.com/) | | Request formats | Responses | | Pricing | [View pricing in the Cloudflare dashboard ↗](https://dash.cloudflare.com/?to=/:account/ai/models/openai/gpt-5.6-luna) | ## Usage ```ts const response = await env.AI.run( 'openai/gpt-5.6-luna', { input: 'Summarize the benefits of API rate limiting in three bullets.', max_output_tokens: 256, }, ) console.log(response) ``` ```bash curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/v1/responses \ --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \ --header "Content-Type: application/json" \ --data '{ "model": "openai/gpt-5.6-luna", "input": "Summarize the benefits of API rate limiting in three bullets.", "max_output_tokens": 256 }' ``` - **Protects system stability:** Prevents overload, reduces outages, and ensures predictable performance during traffic spikes. - **Ensures fair access:** Stops individual users or applications from consuming disproportionate resources. - **Improves security and cost control:** Helps mitigate abuse, brute-force attacks, and unexpected infrastructure usage. ```json { "id": "resp_0e481f0cb46bf357016a4fe99bd5fc8194b6ce2049aa65ab08", "object": "response", "created_at": 1783622043, "status": "completed", "background": false, "billing": { "payer": "developer" }, "completed_at": 1783622044, "error": null, "frequency_penalty": 0, "incomplete_details": null, "instructions": null, "max_output_tokens": 256, "max_tool_calls": null, "model": "gpt-5.6-luna", "moderation": null, "output": [ { "id": "msg_0e481f0cb46bf357016a4fe99c2e288194a6fd0ce3f5f88786", "type": "message", "status": "completed", "content": [ { "type": "output_text", "annotations": [], "logprobs": [], "text": "- **Protects system stability:** Prevents overload, reduces outages, and ensures predictable performance during traffic spikes.\n- **Ensures fair access:** Stops individual users or applications from consuming disproportionate resources.\n- **Improves security and cost control:** Helps mitigate abuse, brute-force attacks, and unexpected infrastructure usage." } ], "phase": "final_answer", "role": "assistant" } ], "parallel_tool_calls": true, "presence_penalty": 0, "previous_response_id": null, "prompt_cache_key": null, "prompt_cache_retention": "in_memory", "reasoning": { "context": "all_turns", "effort": "medium", "mode": "standard", "summary": null }, "safety_identifier": null, "service_tier": "default", "store": false, "temperature": 1, "text": { "format": { "type": "text" }, "verbosity": "medium" }, "tool_choice": "auto", "tool_usage": { "image_gen": { "input_tokens": 0, "input_tokens_details": { "image_tokens": 0, "text_tokens": 0 }, "output_tokens": 0, "output_tokens_details": { "image_tokens": 0, "text_tokens": 0 }, "total_tokens": 0 }, "web_search": { "num_requests": 0 } }, "tools": [], "top_logprobs": 0, "top_p": 0.98, "truncation": "disabled", "usage": { "input_tokens": 19, "input_tokens_details": { "cache_write_tokens": 0, "cached_tokens": 0 }, "output_tokens": 66, "output_tokens_details": { "reasoning_tokens": 0 }, "total_tokens": 85 }, "user": null, "metadata": {} } ``` ## Examples **Pull Request Description** — Using instructions for a cost-sensitive drafting task ```ts const response = await env.AI.run( 'openai/gpt-5.6-luna', { input: 'Write a brief pull request description for a bug fix that prevents duplicate webhook deliveries.', instructions: 'Keep it under 100 words.', max_output_tokens: 256, }, ) console.log(response) ``` ```bash curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/v1/responses \ --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \ --header "Content-Type: application/json" \ --data '{ "model": "openai/gpt-5.6-luna", "input": "Write a brief pull request description for a bug fix that prevents duplicate webhook deliveries.", "instructions": "Keep it under 100 words.", "max_output_tokens": 256 }' ``` ## Summary Prevents duplicate webhook deliveries by ensuring each event is processed only once, even when retries or concurrent requests occur. ## Changes - Added idempotency checks for webhook events. - Prevented duplicate delivery attempts. - Added regression tests covering retries and concurrent processing. ## Testing All existing and new tests pass. ```json { "id": "resp_0bed05adeda548a1016a4fe99d1e408194bb0375bad96ab71a", "object": "response", "created_at": 1783622045, "status": "completed", "background": false, "billing": { "payer": "developer" }, "completed_at": 1783622046, "error": null, "frequency_penalty": 0, "incomplete_details": null, "instructions": "Keep it under 100 words.", "max_output_tokens": 256, "max_tool_calls": null, "model": "gpt-5.6-luna", "moderation": null, "output": [ { "id": "msg_0bed05adeda548a1016a4fe99daa748194992854423ba08e72", "type": "message", "status": "completed", "content": [ { "type": "output_text", "annotations": [], "logprobs": [], "text": "## Summary\nPrevents duplicate webhook deliveries by ensuring each event is processed only once, even when retries or concurrent requests occur.\n\n## Changes\n- Added idempotency checks for webhook events.\n- Prevented duplicate delivery attempts.\n- Added regression tests covering retries and concurrent processing.\n\n## Testing\nAll existing and new tests pass." } ], "phase": "final_answer", "role": "assistant" } ], "parallel_tool_calls": true, "presence_penalty": 0, "previous_response_id": null, "prompt_cache_key": null, "prompt_cache_retention": "in_memory", "reasoning": { "context": "all_turns", "effort": "medium", "mode": "standard", "summary": null }, "safety_identifier": null, "service_tier": "default", "store": false, "temperature": 1, "text": { "format": { "type": "text" }, "verbosity": "medium" }, "tool_choice": "auto", "tool_usage": { "image_gen": { "input_tokens": 0, "input_tokens_details": { "image_tokens": 0, "text_tokens": 0 }, "output_tokens": 0, "output_tokens_details": { "image_tokens": 0, "text_tokens": 0 }, "total_tokens": 0 }, "web_search": { "num_requests": 0 } }, "tools": [], "top_logprobs": 0, "top_p": 0.98, "truncation": "disabled", "usage": { "input_tokens": 33, "input_tokens_details": { "cache_write_tokens": 0, "cached_tokens": 0 }, "output_tokens": 69, "output_tokens_details": { "reasoning_tokens": 0 }, "total_tokens": 102 }, "user": null, "metadata": {} } ``` ## Parameters ▶input `one of`required instructions `string` temperature `number`minimum: 0maximum: 2 max\_output\_tokens `number`exclusiveMinimum: 0 top\_p `number`minimum: 0maximum: 1 stream `boolean` ▶tools\[\] `array` tool\_choice `` ▶text{} `object` ▶reasoning{} `object` id `string` object `string`const: response created\_at `number` model `string` ▶output\[\] `array` output\_text `string` status `string`enum: in\_progress, completed, failed, incomplete ▶usage{} `object` ## API Schemas (Raw) Input Output Was this helpful? YesNo ## On this page [![](https://developers.cloudflare.com/_astro/logo.te5VL_aD.svg)Docs](https://developers.cloudflare.com/) ```json {"@context":"https://schema.org","@type":"TechArticle","@id":"https://developers.cloudflare.com/ai/models/openai/gpt-5.6-luna/#page","headline":"GPT-5.6 Luna (OpenAI) · Cloudflare AI docs · Cloudflare AI docs","description":"GPT-5.6 Luna is an OpenAI GPT-5.6 model optimized for cost-sensitive workloads, using the Responses API for efficient text generation.","url":"https://developers.cloudflare.com/ai/models/openai/gpt-5.6-luna/","inLanguage":"en","image":"https://developers.cloudflare.com/og-docs.png","publisher":{"@type":"Organization","name":"Cloudflare","description":"One platform for your apps, agents, and workforce. Build, secure, and scale without managing infrastructure","url":"https://www.cloudflare.com/","sameAs":["https://github.com/cloudflare","https://www.linkedin.com/company/cloudflare","https://x.com/cloudflare"],"logo":{"@type":"ImageObject","url":"https://developers.cloudflare.com/logo.svg"},"address":{"@type":"PostalAddress","streetAddress":"101 Townsend St","addressLocality":"San Francisco","addressRegion":"CA","postalCode":"94107","addressCountry":"US"},"contactPoint":[{"@type":"ContactPoint","contactType":"Customer Support","url":"https://support.cloudflare.com/","availableLanguage":["English"]},{"@type":"ContactPoint","contactType":"Sales","url":"https://www.cloudflare.com/contact/","availableLanguage":["English"]}]},"isPartOf":{"@type":"WebSite","@id":"https://developers.cloudflare.com/#website","name":"Cloudflare Docs","url":"https://developers.cloudflare.com/"}} ```