Claude Opus 4.8 vs Gemini 3.5 Pro vs GPT-5.6: Developer Model Selection Guide (June 2026)
Three frontier models are competing for your production workloads in June 2026, and choosing wrong isn't a minor inconvenience — it's a 3x cost penalty or shipped results that embarrass you. Claude Opus 4.8, Gemini 3.5 Pro, and GPT-5.6 each win on specific dimensions. None of them wins on all dimensions. The short version: Opus 4.8 for coding tasks inside 200K tokens — nothing else is close on SWE-Bench. Gemini 3.5 Pro for workloads that need more than 500K context. GPT-5.6 for multi-step agent...
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