gpt-5.6

​ 1.1.0 — 2026-07-12

​ API

• api: rename usage field prompt_tokens_details.cache_creation_tokens → cache_write_tokens (chat completions; breaking for consumers reading the old field name); add typed input_tokens_details.cache_write_tokens to Response API usage — now populated for Anthropic-routed Response API requests

• responses: add tool_usage field on Response objects — OpenAI built-in tool consumption metrics (image generation tokens, web search request counts)

​ Routing & Providers

• routing: add claude-sonnet-5 (anthropic), gemma-4-12b-it (siliconflow), ornith-1.0-35b (deepinfra), and gemini-3.1-flash-lite-image (google) canonical models; add deepinfra as a provider for minimax-m3

• routing: add gpt-5.6-luna, gpt-5.6-terra, gpt-5.6-sol (openai), grok-4.5 (xai), and lfm2.5-8b-a1b (together_ai) canonical models; add native alias gpt-5.6 (grok-4.5-latest/grok-build-latest resolve dynamically from xAI provider metadata)

Read from the provider's text; the quote is the provider's exact lines.