AI Gateway: Bedrock Converse API responses missing token usage and cost tracking

[Big-Tree]

Description

When routing AWS Bedrock requests through the AI Gateway, token usage and cost aren't tracked in the dashboard. Requests log correctly (status, model, latency), but usage shows "– in / – out" and cost shows "$ –".

Cause

The Bedrock Converse API returns usage in camelCase, but the gateway only appears to parse snake_case fields:

Bedrock response:

{
  "usage": {
    "inputTokens": 13,
    "outputTokens": 12,
    "totalTokens": 25
  }
}

OpenAI response (tracked correctly):

{
  "usage": {
    "input_tokens": 761,
    "output_tokens": 3441,
    "total_tokens": 4202
  }
}

Steps to Reproduce

1. Route Bedrock requests through AI Gateway using the documented URL rewriting approach
2. Make a request to any Bedrock model (e.g. Claude Sonnet 4.6)
3. Check the AI Gateway logs — tokens and cost are missing

Related

• Cloudflare AI Gateway Fails to Parse Anthropic API usage Object for Token Counts and Costs #20536 — Similar parsing issue with Anthropic direct API

[Big-Tree]

Closing — filed on the correct repo: cloudflare/ai#491