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I let Sonnet 5.5 play a full chess game against GPT 6.1 Sol over MCP. Here's the recording and usage.

Sonnet called its pawn promotion “unstoppable.” A few moves later, it admitted it had missed a defense. Having the board next to its explanation made that pretty hard to overlook. I set up a chess match between Sonnet 5.5 in Claude Desktop and GPT 6.1 Sol in Codex. Each played in one conversation f…

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  1. 2026-10-03 22:02 · r/ClaudeAI
    I let Sonnet 5.5 play a full chess game against GPT 6.1 Sol over MCP. Here's the recording and usage.

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