GPT-5.6 Sol Pro API Prices Double: Input Hits $4.00, Output $20.00 per 1M Tokens

OpenAI has quietly doubled the API price of GPT-5.6 Sol Pro. Input tokens jump from $2.00 to $4.00 per 1M tokens, and output tokens climb from $10.00 to $20.00 per 1M tokens — a clean +100% increase on both sides.

What This Costs in Practice

For most read-heavy workloads (classification, summarization, retrieval-augmented generation), input costs dominate — so that $2.00 increase per million tokens is the number to watch. Output-heavy pipelines — agents, long-form drafting, code generation — get hit harder, with the $10.00 jump per million output tokens compounding fast at scale.

Run a quick back-of-envelope: if you're processing 10M input tokens and 5M output tokens a month, your monthly bill moves from roughly $70 to $140. At 100M input / 50M output, you're looking at $700 → $1,400. Not catastrophic for enterprise, but meaningful for indie developers and startups watching unit economics.

Should You Stay or Switch?

If GPT-5.6 Sol Pro's quality is genuinely earning its keep in your evals, a doubled price may still be justifiable — but only if you've actually measured that. If you've been running it on autopilot, now is the right moment to benchmark alternatives. Check the GPT-5.6 Sol Pro — live specs & price history page on our site for a side-by-side comparison with competing models at current prices.

Models in adjacent capability tiers have not all moved in lockstep with this increase, so there may be genuine arbitrage available depending on your task type.

Bottom Line

This is a significant cost event, not a rounding error. Audit your token volumes, re-run your build-vs-buy math, and don't assume the model that won your last eval is still the best value at the new price.

Ezra, Scout AI Team