Native Bedrock Codex GPT-5.6 Sol lacks explicit cache controls, producing high cache-write spend · Issue #37674 · openai/codex

Codex on AWS bedrock bug causing 10x charges

Summary Native Codex CLI requests to Amazon Bedrock Mantle cannot opt into GPT-5.6 Sol explicit prompt caching. On an agentic coding workload, this has produced a large volume of cache-write tokens...

135 points by TheP1000 62 days ago github.com 51 comments

Summary

A bug in the Codex CLI for Amazon Bedrock Mantle is leading to unexpectedly high charges due to excessive cache-write tokens. The issue affects users trying to utilize GPT-5.6 Sol prompt caching in their coding tasks.

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