OpenAI

GPT-6.1 Sol

OpenAI officially documents gpt-6.1-sol as GPT-6.1 Sol. The model was released on September 29, 2026, has a 1,050,000-token context window, 128,000-token maximum output, and an April 30, 2026 knowledge cutoff. It accepts text and image inputs, produces text output, and supports reasoning, streaming, function calling, structured outputs, and the listed Responses API tools. Standard pricing is $2.00 input, $0.10 cached input, $2.50 cache writes, and $10.00 output per 1M tokens for prompts up to 272K input tokens, with published long-context, Batch/Flex, Fast, and regional-processing rates above. Validate the slash-prefixed staging identifier and account-specific endpoint access before creating a draft.

ActiveReleased September 29, 2026Knowledge cutoff April 30, 2026
Tool callingCan invoke external tools and APIs (function calling) mid-response.Structured outputCan return JSON or schema-constrained responses instead of free text.ReasoningUses extended thinking / chain-of-thought for harder multi-step problems.Effort controlLets you dial thinking depth (low / medium / high) to trade cost for quality.Fine-tuningSupports training a custom variant on your own data (vendor fine-tune API or self-hosted open weights).

Source: https://developers.openai.com/api/docs/models/gpt-6.1-sol, https://developers.openai.com/api/docs/pricing, https://developers.openai.com/api/docs/changelog

Price per 1M tokens
$2 in / $10 out
Context window1,050,000
Max output128,000
Cache read$0.1 / M
Batch discount-50%
Input
  • Text
  • Image
Output
  • Text

Pricing

Every billing leg from the live catalog, in USD per 1M tokens.

Billing legStandardLong contextBatch
Input$2 / M$4 / M$1 / M
Output$10 / M$15 / M$5 / M
Cache read$0.1 / M$0.2 / M$0.05 / M
Cache write$2.5 / M$5 / M$1.25 / M

Long-context rates apply above 272,000 input tokens.

Cost calculator

Billing-grade math over the rate card above, including the thinking tokens most estimates miss.

Hidden reasoning tokens bill as output. 1.0x = thinking off. Medium-effort reasoning typically lands near 3x; heavy reasoning runs 6x to 8x. Set it to match your workload.

Estimated monthly cost
$1.0K
at current list prices
Fresh input$400
Cached input$0.00
Output incl. thinking$600
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Provider

Where this model runs, and what it charges.

PlatformInput / MOutput / MCache read / MBatchAccess
OpenAI
$2$10$0.1✓First-party API

Price history

Has this model gotten cheaper or more expensive?

No changePriced at $2 / $10 per 1M since September 30, 2026.

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Rates are generated from SuperPenguin's live pricing catalog.