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Claude Sonnet 5 vs Gemini 3.5 Flash: Speed vs Depth. Sonnet leads every coding benchmark (+8.1 Pro, +4.2 TB). Gemini leads MCP Atlas (83.6%), is 4x faster (289 tok/s), 2x cheaper. Coding specialist vs tool orchestration speed king — pick your weapon.
GPT-5.5 (82.7% Terminal-Bench, 58.6% Pro, $30/1M) vs Gemini 3.5 Flash (83.6% MCP Atlas, 76.2% TB 2.1, $9/1M, 152 tok/s). GPT-5.5 dominates reasoning & long context. Flash dominates tool orchestration & speed. Official Google DeepMind model card data. 10-point verdict.