OpenAI · AI model API pricing

How much does GPT-5.6 Sol cost?

OpenAI's flagship (GA July 9, 2026) — top of the GPT-5.6 family, priced at the classic frontier rate.

Rate card

What that means per month

Standard on-demand rates from OpenAI's official pricing page, last checked 2026-07-28. Batch API runs at 50% of these rates. Monthly figures exclude caching and batch discounts. Confirm live pricing before committing.

Where GPT-5.6 Sol sits on price

At the reference month of 10M input and 3M output tokens, GPT-5.6 Sol costs $140, which makes it the 29th cheapest of the 30 models tracked here. That is 82× the price of Qwen-Flash, the cheapest model at this mix ($1.70). Among the 10 frontier-class models it ranks 9th, behind GLM-5.2 at $27.2.

Cache economics

Cached input on GPT-5.6 Sol bills at $0.50 per 1M — 10% of its own input rate, against a 10% median across the models here that publish a cached-read price. 2 models discount cached reads more steeply than this. On the reference month, serving 80% of that input from cache takes the input side of the bill from $50 to $14, leaving output untouched at $90 — which is why a high reuse rate changes the ranking above rather than just shaving the total.

Cache reads only. Writes are billed separately by some providers and are excluded here — see the rate note above for OpenAI's terms. Try it at your own hit rate on the AI cost calculator.

Cheaper alternatives

At a reference workload of 10M input / 3M output tokens a month, these cost less than GPT-5.6 Sol ($140/mo):

• Claude Opus 4.8 $125/mo
• Claude Opus 5 $125/mo
• Kimi K3 $75/mo

GPT-5.6 Sol head-to-head