OpenAI releases GPT-6.1 Sol with beta Responses API multi-agent support
OpenAI lists GPT-6.1 Sol for Responses and Chat Completions, with standard pricing for prompts up to 272K input tokens of $2 per million input tokens, $0.10 per million cached input tokens, $2.50 per million cache-write tokens, and $10 per million output tokens. Multi-agent support is in beta through a Responses API request.
SessionWatcher editorial · Published · Updated · Source announcement: 2026-09-29
GPT-6.1 Sol release and pricing
OpenAI's September 29 release notes list GPT-6.1 Sol for the Responses and Chat Completions APIs. The notes describe it as intended for complex coding and professional work at a lower cost than GPT-6 Astra.
For prompts with up to 272K input tokens, standard pricing per 1 million tokens is $2 for input, $0.10 for cached input, $2.50 for cache write, and $10 for output. These are API token rates, not subscription prices.
Sources: Openai release notes: 2026-09-29
Multi-agent support is in beta
GPT-6.1 Sol also supports Multi-agent in beta. OpenAI says this lets the model delegate work to subagents in a Responses API request. Its release note advises using the Responses API for tool calling and points readers to separate model guidance and pricing information for reasoning settings and processing tiers.
Sources: Openai release notes: 2026-09-29
AI assisted reporting, checked against the linked official sources. Source pages checked 2026-09-30. Editorial process and corrections.