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fix: normalize OpenAI token counting, add branch source tracking

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pi-ai:
- Fixed usage.input to exclude cached tokens for OpenAI providers
- Previously input included cached tokens, causing double-counting
- Now input + output + cacheRead + cacheWrite correctly gives total context

coding-agent:
- Session header now includes branchedFrom field for branched sessions
- Updated compaction.md with refined implementation plan
- Updated session.md with branchedFrom documentation
This commit is contained in:
Mario Zechner
2025-12-03 17:11:22 +01:00
parent 6cd8bcdeb3
commit 989af79752
7 changed files with 65 additions and 25 deletions
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packages/ai/CHANGELOG.md
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@@ -4,6 +4,8 @@
### Fixed
- **OpenAI Token Counting**: Fixed `usage.input` to exclude cached tokens for OpenAI providers. Previously, `input` included cached tokens, causing double-counting when calculating total context size via `input + cacheRead`. Now `input` represents non-cached input tokens across all providers, making `input + output + cacheRead + cacheWrite` the correct formula for total context size.
- **Fixed Claude Opus 4.5 cache pricing** (was 3x too expensive)
- Corrected cache_read: $1.50 → $0.50 per MTok
- Corrected cache_write: $18.75 → $6.25 per MTok