💰Native Bedrock Codex GPT-5.6 Sol Cache Control Missing
Cache control missing in Native Bedrock Codex, high costs for agentic workloads
TL;DR
The Native Bedrock Codex GPT-5.6 Sol model doesn't have explicit cache control options, leading to excessive cache-write spending for agentic coding workloads. Estimated cost: $1,182.09 over four days.
Native Bedrock Codex GPT-5.6 Sol lacks explicit cache controls, causing high cache-write spend in agentic coding workflows. This issue affects Native Codex CLI requests to Amazon Bedrock Mantle, with cache writes accounting for about 85% of the model's estimated $1,182.09 cost over four days. If you're using agentic workloads on Bedrock, this is a big deal as it could significantly impact your AWS bill.
Key Points
Cache-write tokens per request average around 88K in agentic coding workflows on Native Bedrock Codex GPT-5.6 Sol.
Estimated cost of cache writes for the period August 5th to August 8th, 2026: $1,182.09.
Cache writes account for about 85% of the model's total estimated spend in agentic coding scenarios.
A local Codex session reported 76 Sol requests with 6.709M cache_write_input_tokens during testing.
AWS documents explicit cache mode for GPT-5.6 on Bedrock specifically for agentic workflows, but Native Bedrock doesn't support it.
Why It Matters
If you're using the Native Codex CLI with Amazon Bedrock Mantle for agentic coding workloads, this is a big deal. Cache writes account for about 85% of your costs, and without explicit cache controls, your AWS bill could skyrocket. The estimated cost over four days was $1,182.09.
Frequently Asked Questions
Why does this matter?
If you're using the Native Codex CLI with Amazon Bedrock Mantle for agentic coding workloads, this is a big deal. Cache writes account for about 85% of your costs, and without explicit cache controls, your AWS bill could skyrocket. The estimated cost over four days was $1,182.09.
What happened?
The Native Bedrock Codex GPT-5.6 Sol model doesn't have explicit cache control options, leading to excessive cache-write spending for agentic coding workloads. Estimated cost: $1,182.09 over four days.
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