Claude Opus 4.8 vs GPT-6 Sol

Anthropic's Claude Opus 4.8 against OpenAI's GPT-6 Sol — price, context and what each is best at. Both are available through one OpenAI-compatible API.

AnyModel — you pay	Claude Opus 4.8	GPT-6 Sol
Vendor	Anthropic	OpenAI
Input / 1M	$0.2	$0.1
Output / 1M	$0.2	$0.1
Context	1M	1M
Best for	Architecture	Codex CLI

Claude Opus 4.8

The current Opus — Anthropic's agentic-coding flagship.

Claude Opus 4.8 leads the Claude 4 line on nuanced reasoning, agentic coding and careful long-form writing, now with a 1M-token context window. The go-to when output quality matters more than cost.

More about Claude Opus 4.8 →

GPT-6 Sol

OpenAI's GPT-6 workhorse for coding and everyday work.

GPT-6 Sol is the everyday tier of the GPT-6 line, trained with the same methods as Astra: OpenAI's workhorse for agentic coding and day-to-day engineering, with long autonomous sessions, repo-scale edits, reliable tool calling and reasoning effort up to max, at a fifth of Astra's vendor price. The default pick for most Codex work; reach for Astra when the task is unusually hard.

More about GPT-6 Sol →

Quick take: GPT-6 Sol is cheaper on output tokens ($0.1 vs $0.2 per 1M). Compare their strengths and context for your task; you can switch the model id at any time.

FAQ

Which is cheaper, Claude Opus 4.8 or GPT-6 Sol?

GPT-6 Sol is cheaper on output tokens ($0.1 vs $0.2 per 1M).

Which has a larger context window, Claude Opus 4.8 or GPT-6 Sol?

Claude Opus 4.8: 1M; GPT-6 Sol: 1M.