DeepSeek-V4-Pro-0813 vs Claude Opus 5.5
DeepSeek-V4-Pro-0813 vs Claude Opus 5.5 side by side: arena.ai text score, list price per 1M tokens, context window and licence, with sources. Data checked 2026-10-11.
Executive Verdict
On the arena.ai text leaderboard, DeepSeek-V4-Pro-0813 scores 1465 (±7, #55) and Claude Opus 5.5 scores 1507 (±8, #2). Claude Opus 5.5 leads by 42 points, outside the margin of error. DeepSeek-V4-Pro-0813: $1.32 input / $3.96 output per 1M tokens. Claude Opus 5.5: $4.00 / $20.00. Blended at 3 input : 1 output, DeepSeek-V4-Pro-0813 costs 75% less ($1.98 vs $8.00 per 1M tokens). Context windows are about the same: DeepSeek-V4-Pro-0813 1M tokens, Claude Opus 5.5 1M tokens. DeepSeek-V4-Pro-0813 has open weights (MIT) and can be self-hosted; Claude Opus 5.5 is available only as a hosted API.