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Claude Code merged support for OSC 7501

Anthropic's Claude Code v2.1.295 added support for OSC 7501 (program status), a terminal escape sequence that reports an application's status, according to a post by Mitchell Hashimoto on X. Hashimoto said the protocol support "will help hundreds or thousands of downstream applications" and that Anthropic verified it works through Rex, a tool he referenced. A commenter offered to commit to adding OSC 7501 support to their own harness within 4 hours of receiving Rex beta access.

read1 min views2 publishedOct 8, 2026
Claude Code merged support for OSC 7501
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Mitchell Hashimoto on X: "Claude Code v2.1.295 supports OSC 7501 (program status). Incredible speed @AnthropicAI supporting this protocol which will help hundreds or thousands of downstream applications! They had access to Rex and verified through Rex it works. 🥰"

Claude Code v2.1.295 supports OSC 7501 (program status). Incredible speed @AnthropicAI supporting this protocol which will help hundreds or thousands of downstream applications! They had access to Rex and verified through Rex it works. 🥰

Claude Code v2.1.295 supports OSC 7501 (program status). Incredible speed @AnthropicAI supporting this protocol which will help hundreds or thousands of downstream applications! They had access to Rex and verified through Rex it works. 🥰

Yeah this is great can I get access to Rex to make sure OpenCode works through it, don't worry about contacting any of my coworkers you can just contact me

I will commit to turning around OSC 7501 support in my harness within 4 hours of getting access to the Rex beta. (My harness has 1 user but we're growing fast.)

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