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GPT-6.1 Sol

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openai/gpt-6.1-sol · by OpenAI · decoder-only-transformer

Pricing — 1 offering(s)

OpenAI

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Input tokens

  • $2.00 / 1M tokens (input) Current 2026-09-29 → present
    Standard processing, short-context rate. Cached input and cache writes are their own tiers (cached-input…

    Standard processing, short-context rate. Cached input and cache writes are their own tiers (cached-input, cache-write; ADR-0015). Also on OpenAI's pricing page but NOT tracked as tiers here: long-context (>272K input tokens) $4.00/1M input and $15.00/1M output, and Batch/Flex at 50% of Standard. No promotional-pricing caveat shown.

Output tokens

  • $10.00 / 1M tokens (output) Current 2026-09-29 → present
    Standard processing, short-context rate. See the input tier's note for the long-context and Batch/Flex rates…

    Standard processing, short-context rate. See the input tier's note for the long-context and Batch/Flex rates that aren't tracked here.

Cached input tokens

  • $0.10 / 1M tokens (cached input) Current 2026-09-29 → present
    ADR-0015: Standard processing, short-context cached input (half GPT-6 Sol's $0.20). Moved from the input…

    ADR-0015: Standard processing, short-context cached input (half GPT-6 Sol's $0.20). Moved from the input tier's notes to its own tier and re-verified on the pricing page's Standard table 2026-10-01. Long-context cached input isn't tracked (long context isn't tracked for input either).

Cache writes

  • $2.50 / 1M tokens (cache write) Current 2026-09-29 → present
    ADR-0015: Standard processing, short-context cache writes. Moved from the input tier's notes to its own tier…

    ADR-0015: Standard processing, short-context cache writes. Moved from the input tier's notes to its own tier and re-verified on the pricing page's Standard table 2026-10-01.

Showing the active price and any recorded history. Full pricing history is available via the paid API — see API docs.

See how GPT-6.1 Sol fits into a cost-aware routing setup

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Capability profile

How GPT-6.1 Sol rates across core capability dimensions, with the task-level evidence behind each rating.

context window Strong

1,050,000-token context window (922,000 max input), 128,000 max output tokens (developers.openai.com/api/docs/models/gpt-6.1-sol).

tool use Strong

OpenAI API docs: supports function calling, web search, file search, code interpreter, computer use and MCP via the Responses API. Chat Completions is supported without tool calling.

cost efficiency Moderate

Middle tier of the GPT-6 family ($2/$10 per 1M tokens, Standard, short context): one fifth of Astra, 20x Luna. Cached input $0.10/1M, half GPT-6 Sol's rate.

Ratings are estimated — limited independent data is available for this model.

Coding benchmarks

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Benchmark Score Harness Source
terminal-bench-4-0 55.1% 2026-09 mini-swe-agent 📊 leaderboard ↗

Operator guidance

Middle tier of GPT-6, launched 2026-09-29 as the replacement for GPT-6 Sol at the same $2/$10 price. OpenAI positions it as near-Astra performance at a lower cost and suggests comparing it with Astra on your own tasks. Step up to GPT-6 Astra for the hardest end-to-end work, or down to GPT-6 Luna for cost-sensitive, high-volume workloads. Tool calling requires the Responses API.

Use cases

Limitations

Citations