# Introducing GPT-6.1 Sol

The model approaches GPT-6 Astra benchmark performance across coding and professional tasks at $2 per million input and $10 per million output tokens.

- Cached input costs $0.10 per million tokens, 50% lower than GPT-6 Sol's cached input pricing.
- Available immediately via the API as gpt-6.1-sol and for Plus, Pro, Business, Enterprise, and Edu tiers in ChatGPT Work and Codex.
- Matches GPT-6 Astra on the DeepSWE v1.1 benchmark and scores within 2.1 percentage points of Astra on OSWorld 2.0.
- OpenAI plans to roll out an Ultrafast variant generating tokens up to 8x faster in Codex.

## Why it matters

Developers building agentic workflows and coding tools can achieve near-flagship performance at one-fifth the standard token cost of GPT-6 Astra.

## Sources

- [OpenAI: Introducing GPT-6.1 Sol](https://openai.com/index/introducing-gpt-6-1-sol)

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Summarized by dstilled on 2026-09-29. https://dstilled.ai/story/77f8ee4b-94e7-49fb-b51d-d2f50d5396cb