# OpenAI Cuts GPT-5.6 Sol Prices to $4 and $20 Per Million Tokens and Guarantees the Rate to November

The reduction is 20 percent on input and 33 percent on output, and it arrives the same week the model family reaches Amazon's Kiro development environment.

- Published: 2026-08-25T06:26:21.272Z
- Canonical: https://polylog.news/ai/2026-08-25/openai-cuts-gpt-5-6-sol-prices-to-4-and-20-per-million-token
- Publisher: Polylog (AI desk)
- Section: tech
- Sources: [Polylog editors](https://polylog.news), [OpenAI News](https://openai.com/index/gpt-5-6-in-kiro/)

OpenAI lowered the price of its flagship reasoning tier. GPT-5.6 Sol now costs $4 per million input tokens and $20 per million output tokens, down from $5 and $30, a cut of 20 percent on input and 33 percent on output. [Winbuzzer reports](https://winbuzzer.com/2026/08/23/openai-cuts-gpt-5-6-sol-api-prices-by-up-to-33-percent-through-november-21-xcxwbn/) the rate is guaranteed through at least November 21, 2026, and applies to the pay-as-you-go application programming interface (API), Codex credits, and eligible ChatGPT Work plans. Requests above 272,000 input tokens are billed at twice the input rate and 1.5 times the output rate for the entire request, so the discount shrinks precisely for the long-context requests that agent workloads generate most.

The length of the commitment matters more than the size of the cut. A three-month guaranteed price floor lets a buyer plan unit economics for a full quarter, which is what enterprise procurement actually needs, and it is harder for OpenAI to reverse than a short-term promotional discount. [Enterprise DNA counts this](https://enterprisedna.co/resources/ai-pulse/ai-pulse-2026-08-23-openai-cuts-gpt-5-6-sol-api-pricing-20-33-the-third-cut-on-t/) as the third price reduction on the GPT-5.6 family within a month.

Distribution expanded at the same time. OpenAI said GPT-5.6 is [now available inside Kiro](https://openai.com/index/gpt-5-6-in-kiro/), Amazon's agentic development environment, across three tiers rolling out in Amazon Web Services (AWS) regions in US-East-1 and Europe (Frankfurt). By OpenAI's own measurement, Sol scores 80 on the Coding Agent Index and 88.8 percent on Terminal-Bench 2.1, which the company says beats Claude Fable 5 on both benchmarks while using less than half the output tokens. Terra scores 77.4 and is priced at $2 and $12 per million input and output tokens. Luna scores 74.6 and is priced at $0.20 and $1.20 per million input and output tokens.

Those benchmark figures come from OpenAI and have not been independently verified. The more checkable claim involves token accounting: if Sol genuinely finishes agent tasks using fewer output tokens, its real cost advantage is larger than the listed price suggests, because output tokens make up most of agent billing.

## What this means

OpenAI is now competing on committed price and on tokens consumed per completed task at the same time, which pressures rivals along two dimensions at once. Anthropic is the most directly exposed, since coding agents are its strongest commercial position and OpenAI is explicitly benchmarking against Claude Fable 5. Inference margins across the API market compress further as a result, and the vendors best able to absorb that are the ones that control their own serving hardware economics. For engineering teams, the practical shift is that reasoning-tier pricing is now negotiable and time-limited, so architecture decisions that assume a fixed cost per token for a full year are already outdated.

## What to watch

- Whether Anthropic or Google respond with matching cuts or with committed-rate windows of their own, which would confirm that price commitments have become the competitive instrument rather than headline rates.
- Whether independent evaluators reproduce the claim that Sol uses less than half the output tokens of Claude Fable 5 on the same tasks, since that ratio, not the list price, decides real agent bills.
- What happens to Sol pricing after November 21, which will show whether these cuts reflect falling serving costs or a temporary bid for market share.