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DeepSeek V4 Pro (0813) is the August 13, 2026 general-availability checkpoint of DeepSeek V4 Pro, adding DSpark speculative decoding, reasoning-effort levels, and native OpenAI Responses API support. It is DeepSeek's flagship model for coding, reasoning, and agentic tasks in the V4 generation.
Claude Opus 5.5 is Anthropic's flagship model released September 22, 2026 as the first of the Claude 5.5 family, with a 1M-token context window, text, image, and file input, and pricing of $4/$20 per million input/output tokens. Anthropic says it performs at the level of Claude Fable 5.1 on most work while costing about 40% less to run than Opus 5, and it leads on agentic coding, multi-step changes in large codebases, and long-horizon knowledge work.
Benchmarks
Head-to-head scores across reasoning, coding, and agentic indices, plus per-domain rankings.
Intelligence
Claude Opus 5.5 (Max, Default Fallback)Claude Sonnet 5.5 (Max, Default Fallback)
