GPT 5.6 Sol: current reasoning model on Okou
A current reasoning model with Built-in access through Okou.
400K tokens · Text / Vision / Code · Prompt cache
A current reasoning model from OpenAI, available in Okou's public model catalog.
What is GPT 5.6 Sol?
July 2026 preview (top tier of the GPT-5.6 family)
Okou currently offers GPT 5.6 Sol in its public reasoning model catalog. Select it with model ID gpt-5.6-sol; its relative Built-in cost is tier $$$.
Specs at a glance
GPT 5.6 Sol benchmarks
Preview figures from OpenAI's GPT-5.6 Sol materials, shown against the public GPT-5.5 numbers. Treat all percentages as directional: the family is in preview and OpenAI has flagged training-data contamination on SWE-bench Verified across frontier models.
GPT 5.6 Sol pricing
Relative Built-in credit cost. Actual charges depend on usage and settings; check the app for current prices.
Best agent tasks for GPT 5.6 Sol
The orchestrator running a multi-tool plan
Use Sol as the planner that breaks a request into ten steps, dispatches each to a Terra- or Luna-tier sub-agent, and stitches the results back together. Running Sol only at the planner layer costs a fraction of running it end-to-end, with most of the quality preserved.
The first-try code edits that don't waste a CI run
Ask Sol to migrate a 50-file codebase from one ORM to another, refactor a tangled module, or apply a security fix across the repo. The patch applies cleanly on the first attempt more often than any other tier in the family — which is exactly what your CI bill reflects.
The computer-use agent that has to finish the workflow
When the agent drives a browser through a multi-step booking flow, a desktop app, or a legacy admin UI, Sol's stronger OSWorld score means fewer mid-run derailments and fewer human takeovers.
The hard-math or hard-science research step
Drop a competition-grade math set or a graduate physics derivation in and Sol works through it without the off-by-one slips you see on lighter tiers. AIME 2025 and GPQA Diamond pick up exactly this behaviour.
Frequently asked questions
What is GPT 5.6 Sol's context window?
400,000 tokens, with up to 128K tokens of output per response. The full window bills at standard rates.
When should I pick Sol over GPT 5.6 Terra?
When (a) the agent is the planner and decisions cascade, (b) the run is long enough that Terra starts mis-routing tool calls, or (c) the output must apply cleanly on the first attempt — code edits, structured payloads, computer-use workflows.
Using GPT 5.6 Sol on Okou
Choose GPT 5.6 Sol in the chat model selector when it is enabled for your workspace. Available provider connections and billing are shown in model settings.
Credits and the $$$ price tier
Relative Built-in credit cost. Actual charges depend on usage and settings; check the app for current prices.
Available on Okou since July 2026 (preview).
