OpenAI launches GPT-6.1 Sol with Astra-level coding at one-fifth the cost
OpenAI announced GPT-6.1 Sol on September 29, 2026, during its DevDay event. The model is an upgraded version of GPT-6 Sol, released about a week earlier, and OpenAI says it delivers performance approaching the flagship GPT-6 Astra at one-fifth the standard input/output token cost. In the DeepSWE v1.1 coding benchmark, GPT-6.1 Sol matched Astra's score while beating GPT-6 Sol by 6.4 points at…
Key points
- GPT-6.1 Sol matches GPT-6 Astra on DeepSWE coding at one-fifth the cost, OpenAI says
- API pricing: $2 input, $0.10 cached input, $10 output per million tokens
- Available now for Plus, Pro, Business, Enterprise, Edu, ChatGPT Work, and Codex
Model pages: GPT-6 Sol → · GPT-6 Astra → · GPT-6 Astra Ultrafast →
The story so far
9 episodes →- OpenAI launches GPT-6.1 Sol with Astra-level coding at one-fifth the costthis story
OpenAI Announces 'GPT-6.1 Sol': Performance Approaching Astra at One-Fifth the Cost
note.com · 12 October 2026
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