WhichAI / Compare / Claude Opus 5 vs GPT-5.6 Sol

Claude Opus 5vsGPT-5.6 Sol

Claude Opus 5 scores higher on the September 8, 2026 index. Full context below: price, context window, strengths and honest limits. Verified September 8, 2026.

Claude Opus 5

GPT-5.6 Sol

Provider

AA index

58.9

Released

2026-07-24

2026-07-09

Context

Price $/1M

$5 / $25

$5 / $30

Access

Released July 24, 2026 · Claude Pro / Max plans · API $5/$25 per 1M tokens (Fast mode $10/$50)

Released July 9, 2026 (rolling out) · API $5/$30 per 1M tokens · up to 750 tok/s on Cerebras

n/a = not published or not yet verified. Scores marked ~ are WhichAI estimates and should not be compared 1:1 with measured scores.

In one line each

Claude Opus 5: Anthropic's July flagship: 1M context, thinking on by default, computer use, and the Agentic Index lead, at unchanged Opus pricing. The default choice for long agentic runs where you want one model to hold the whole task.

GPT-5.6 Sol: OpenAI's July flagship: max reasoning effort, programmatic tool calling and an 'ultra mode' that spins up subagents. Since GPT-6 Astra arrived at double the output price, Sol is the better-value half of OpenAI's line for agentic work.

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