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

Claude Opus 5vsGPT-5.6 Sol

Claude Opus 5 scores higher on the July 16 index. Full context below: price, context window, strengths and honest limits. Verified July 26, 2026.

Claude Opus 5

GPT-5.6 Sol

Provider

AA index

60.7

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 fourth release in two months and the new overall #1: tops the AA Intelligence Index (60.7) and the Agentic Index (55.3) with 1M context, default thinking and computer use, at unchanged Opus pricing. Near-Fable quality at half the price.

GPT-5.6 Sol: OpenAI's new flagship and #1 on the public AA index snapshot: max reasoning effort, programmatic tool calling, and an 'ultra mode' that spins up subagents. The model to beat for hard reasoning and agentic work.

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