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GPT-6.1 Sol is OpenAI’s cost-positioned GPT-6 family model that the company describes as near–GPT-6 Astra intelligence for agentic coding, computer use, and professional work at about one-fifth of Astra’s standard input/output token prices. API id: gpt-6.1-sol. Standard API prices on the launch post and docs: $2 / $0.10 / $10 per million tokens for input / cached input / output. It is available in ChatGPT Work and Codex for Plus, Pro, Business, Enterprise, and Edu, and is not yet in Chat. Companion flagship write-up: GPT-6 Astra.

Pricing and Availability

From OpenAI’s “Introducing GPT-6.1 Sol” page and the developers model card:

Metric GPT-6.1 Sol GPT-6 Astra (standard, for contrast)
Input / 1M tok $2.00 $10.00
Cached input / 1M tok $0.10 $1.00
Output / 1M tok $10.00 $50.00

Docs also list cache writes at $2.50 / 1M tokens, a 1,050,000 context window, 922,000 max input tokens, 128,000 max output, knowledge cutoff April 30, 2026, and reasoning.effort values including low, medium (default), high, xhigh, and max. Long-context and Fast/Ultrafast multipliers are documented on the same model page—read that page before budgeting large prompts.

OpenAI says GPT-6.1 Sol Ultrafast (up to 8× faster token generation vs standard in Codex) would follow in the coming days after the launch post.

How OpenAI Contrasts Sol and Astra

Official framing: Sol is the near-Astra / fifth-price option; Astra remains “most intelligent” for hardest work. Launch-post examples include DeepSWE v1.1 (Sol matching Astra at roughly one-fifth cost in their charting), GDP.pdf and AutomationBench gains over GPT-6 Sol, OSWorld computer-use gains, and Terminal-Bench Science cost notes where Astra still leads the highest score among models they plotted.

Safety Pointer

OpenAI links a GPT-6.1 Sol system card addendum and states alignment metrics move closer to Astra versus GPT-6 Sol (transparency, respecting restrictions, no automated safety-reviewer bypass attempts matching Astra/Sol). Details belong in that card, not in a paraphrase beyond what the launch page asserts.

FAQ

Is GPT-6.1 Sol in ChatGPT Chat?

Not yet, per the launch post. It is in ChatGPT Work and Codex, plus the API.

What is the API model name?

gpt-6.1-sol

How does it differ from Astra on price?

Standard Sol input/output are $2 / $10 per MTok versus Astra $10 / $50; cached input $0.10 vs $1.00 on the launch comparison cards.

Sources