Question 1

Claude Opus vs GPT-5.6 Sol: which is better?

Accepted Answer

The headline matchup, and closer than either vendor's marketing suggests. GPT-5.6 Sol edges ahead on the overall benchmark snapshot; Claude Opus 5 leads on agentic and coding work. Sol is the better generalist across modalities, Opus the better engineer. At this point the deciding factor is usually which ecosystem your code already lives in, not raw capability.

Question 2

When should you use Claude Opus?

Accepted Answer

Agentic coding and multi-step engineering work — near the ceiling, at half the price. Specifically: Multi-step agentic coding where the model runs for a long time without supervision; Large refactors that must respect an existing codebase's conventions; You want reasoning-effort control to trade cost against depth.

Question 3

When should you use GPT-5.6 Sol?

Accepted Answer

The strongest generalist — complex agentic and scientific work across modalities. Specifically: One model for text, vision and audio in the same pipeline; You are already deep in OpenAI tooling and want the least migration friction; General knowledge and scientific work rather than shipping code.

	Claude Opus	GPT-5.6 Sol
Provider	Anthropic	OpenAI
Current release	Opus 5	GPT-5.6 Sol
Tier	Frontier	Frontier
Context	1M	1M
Cost	Premium	Frontier price
Modalities	text, vision	text, vision, audio
Open weights	No	No

Claude Opus vs GPT-5.6 Sol

Which one to pick

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