How to use GPT-6.1 Sol API
To call the GPT-6.1 Sol API, send a POST request to https://api.openai.com/v1/responses with model : gpt-6.1-sol and your key as a Bearer token. The costs are the same $2 for inputs and $10 for outputs per million tokens as GPT-6 Sol, and cached input drops from $0.20 to $0.10. The migration from gpt-6-sol is largely a string swap.
To use the GPT-6.1 Sol API, you send a POST request to https://api.openai.com/v1/responses with the model set to gpt-6.1-sol and your key as a Bearer Token. The cost is the same as GPT-6 Sol at $2 for inputs and $10 for outputs per million tokens. Cached input drops from $0.20 to $0.10. Migrating from gpt-6-sol is mostly a string swap.
The main change is how usage works: GPT-6.1 Sol doesn't accept none or minimal effort levels, so you must switch them to low. OpenAI introduced GPT-6.1 Sol on DevDay on September 29, 2026. This guide covers the first request, selecting the effort level, migration changes, batch, flex, and fast tiers, and regression testing for both model IDs in Apidog before moving to production traffic.
GPT-6 Sol and GPT-6.1 Sol have most specifications identical. The following differences are based on the GPT-6.1 Sol model page, the GPT-6 Sol model page, and OpenAI's GPT-6 migration guide.
Written by urgent.news from Dev.to's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
