Claude Opus 5.5vsGPT-6 Sol
Model vs model

Claude Opus 5.5 vs GPT-6 Sol

Claude Opus 5.5 costs $4/$20 and GPT-6 Sol costs $2/$10 per 1M input/output tokens on the API.

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Quick answer

These are the two coding-agent defaults: Claude Opus 5.5 in Claude Code and GPT-6 Sol in Codex. Sol is half the price at $2 / $10 per 1M tokens against Opus 5.5's $4 / $20, so for API-metered agent work Sol is the cheaper default; if you are already paying for a Claude plan and working in Claude Code, Opus 5.5 is what you get without changing anything.

Claude Opus 5.5 vs GPT-6 Sol specs

SpecClaude Opus 5.5GPT-6 Sol
ReleasedSep 22, 2026Sep 22, 2026
StatusAvailableRolling out
API model IDclaude-opus-5-5gpt-6-sol
API price (in / out)$4 / $20 per 1M tokens$2 / $10 per 1M tokens
Cache read$0.20 per 1M tokens$0.20 per 1M tokens
Context window1M tokens1.05M tokens
PlansPro, Max, Team, EnterprisePlus, Pro, Business, Enterprise, Edu
PlatformsClaude API, Amazon Bedrock, Claude Platform on AWS, Google Cloud, Microsoft FoundryOpenAI API
Runs inClaude, Claude CodeCodex, ChatGPT

"-" means we could not verify the value on a vendor page, not that it doesn't exist.

Claude Opus 5.5 vs GPT-6 Sol FAQ

Which is cheaper, Claude Opus 5.5 or GPT-6 Sol?

GPT-6 Sol, at $2 input and $10 output per 1M tokens (short-context rates), half of Claude Opus 5.5's $4 / $20.

Are they both coding-agent defaults?

Yes. Claude Code defaults to Opus 5.5 on Pro, Max, Team, Enterprise and the API; OpenAI's changelog names GPT-6 Sol the Codex default, starting on the Sol Light preset.

When were they released?

The same day, September 22, 2026.

Which plans include them?

Opus 5.5 is on Claude Pro, Max, Team and Enterprise. GPT-6 Sol is rolling out to Plus, Pro, Business, Enterprise and Edu in Codex and ChatGPT Work.

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Sources

Claude Opus 5.5 detailsGPT-6 Sol details