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fix: stop billing cached Anthropic/Bedrock input tokens as uncached - #1546
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With `ai` 6 and `@ai-sdk/anthropic` 3, `usage.inputTokens` is the inclusive total and `usage.inputTokenDetails` splits it into no-cache, cache-read and cache-write tokens. `Session.getUsage` still assumed Anthropic and Bedrock exclude cached tokens from `inputTokens`, so every cached step was charged the full input again at the uncached rate on top of the cache read/write charges. On cache-heavy agent sessions the reported cost was about 6x the real cost, and `tokens.input` / `tokens.inputTotal` were inflated the same way. - Use `inputTokenDetails` (no-cache, cache read, cache write) when the SDK reports it; keep the legacy path for the pre-v6 usage shape. - Regression tests with the exact v6 usage shape for Anthropic and Bedrock, including cache write taken from the details when provider metadata lacks it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
`accountUsage` rebuilt the usage object without `inputTokenDetails`, so the learning bootstrap and review-import flows still billed the inclusive input count as uncached and double-counted cache reads in their token totals. - Pass `inputTokenDetails` (now typed with `noCacheTokens`) through to `Session.getUsage`. - Tests: learning-flow cost on the v6 shape, a full cache hit, and the OpenAI v6 shape without cache writes. - Update the telemetry comment that described the old Anthropic assumption. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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📝 Walkthrough
Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation |
|---|---|---|
| Linked Issues check |  |
Issue #1545 requires correct Anthropic and Bedrock accounting for AI SDK v6 inclusive inputTokens, correct tokens.input/tokens.inputTotal, and propagation through learning accounting. The PR use… |
| Out of Scope Changes check | |
The changed source files and tests directly support issue #1545. The declaration update enables the required cache split, the telemetry edit documents the changed token semantics, and the tests cover … |
| Docstring Coverage | |
Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 6 files. |
| Description check | |
The description follows the required template. It identifies the issue, marks the change as a bug fix, explains the implementation and behavior changes, documents verification, notes that screenshots … |
| Title check | |
The title clearly and concisely describes the primary change: preventing cached Anthropic and Bedrock input tokens from being billed as uncached. |
Full details: Linked Issues check
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Explanation
Issue
#1545requires correct Anthropic and Bedrock accounting for AI SDK v6 inclusiveinputTokens, correcttokens.input/tokens.inputTotal, and propagation through learning accounting. The PR usesinputTokenDetailswhen numericnoCacheTokensis present, keeps the legacy path otherwise, forwards the details inaccountUsage, and adds tests for Anthropic, Bedrock, full cache hits, cache writes, OpenAI v6 compatibility, and learning cost estimation. The changes also preserve the documented token semantics in telemetry.
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Explanation
The changed source files and tests directly support issue
#1545. The declaration update enables the required cache split, the telemetry edit documents the changed token semantics, and the tests cover the new accounting paths. No unrelated behavior or unrelated files appear in the whole-PR diff.
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Explanation
The description follows the required template. It identifies the issue, marks the change as a bug fix, explains the implementation and behavior changes, documents verification, notes that screenshots are not applicable, and completes the checklist.
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A rabbit counts the tokens right
Cache-read, cache-write, sorted neat
Uncached totals join the sum
Session costs now match the split
The rabbit thumps a happy beat
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Code Review SummaryStatus: No Issues Found | Recommendation: Merge Files Reviewed (6 files)
Previous Review Summary (commit aa24e4d)Current summary above is authoritative. Previous snapshots are kept for context only. Previous review (commit aa24e4d)Status: No Issues Found | Recommendation: Merge Files Reviewed (6 files)
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Review comments at @packages/opencode/src/altimate/learn/usage.ts:
- Around line 17-26: Update the inputTokens mapping in sdkUsage before
accountUsage calls Session.getUsage so details-only usage reconstructs the
inclusive input count by summing noCacheTokens, cacheReadTokens, and
cacheWriteTokens when all three are numbers. Preserve the existing
rawUsage.inputTokens and usage.inputTokens precedence, and leave the count
undefined when the details are incomplete.
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📒 Files selected for processing: 6
packages/opencode/src/altimate/learn/reflect.tspackages/opencode/src/altimate/learn/usage.tspackages/opencode/src/altimate/telemetry/index.tspackages/opencode/src/session/index.tspackages/opencode/test/altimate/learn/reflect.test.tspackages/opencode/test/session/session-getusage.test.ts
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View guided diff | Turn on auto-fix | Re-trigger cubic
With cache writes no longer folded into `tokens.input`, the long-context tier check missed requests that crossed 200K mostly through cache writes. The threshold now sums uncached input, cache reads and cache writes. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Issue for this PR
Closes #1545
Type of change
What does this PR do?
With
ai6 and@ai-sdk/anthropic3,usage.inputTokensis the inclusive total, andusage.inputTokenDetailssplits it into no-cache, cache-read and cache-write tokens.Session.getUsagestill assumed Anthropic and Bedrock report uncached input only. So a cached step was charged the whole input at the uncached rate, plus the cache read and write charges.Session.getUsageusesinputTokenDetailswhen the SDK reportsnoCacheTokens. Older usage without the split takes the old path.accountUsagenow passesinputTokenDetailsthrough. It used to drop them, so it had the same bug.Behaviour changes:
tokens.input(traces,tokens_inputtelemetry)tokens.inputTotalWho this affects: everyone on Anthropic, Bedrock or Vertex-Anthropic models. Their displayed session cost, trace cost and cost telemetry fall to the real figure, about 1/6 on cache-heavy sessions. Dashboards that track cost over time will show a step down at this release.
How did you verify your code works?
session-getusagecases use the exact v6 usage shape: Anthropic cost on a real step's token counts, Bedrock, a full cache hit, cache write taken from the details, and the OpenAI v6 shape. I added a learning-flow cost test.session-getusagecases fail onmain, run in a detached worktree atmain: 3 of the 15 cases in that file failed.getUsage/accountUsagepasses: 2,085 pass, 0 fail (2,036 pass, 0 fail on the final head across the getUsage suites).bun run typecheckis clean, andscript/upstream/analyze.ts --markers --base main --strictpasses.input × $4 + cacheRead × $0.20 + cacheWrite × $5 + output × $20, with the inclusive input.Screenshots / recordings
Not a UI change.
Checklist
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Note
Medium Risk
Changes core token and cost accounting for all Anthropic-family sessions; reported costs and
tokens_inputtelemetry will drop on cache-heavy workloads, while OpenAI-style providers should stay on the equivalent split/subtraction path.Overview
Fixes over-billing on Anthropic, Bedrock, and Vertex-Anthropic when AI SDK v6 reports inclusive
inputTokensplusinputTokenDetails(no-cache / cache-read / cache-write).Session.getUsagehad still treated those providers like the old shape whereinputTokenswas uncached-only, so cache-heavy steps were charged at the full uncached rate and cache read/write — often ~6× the real cost.Session.getUsagenow keys offnoCacheTokensininputTokenDetailswhen present: uncached input, cache read/write, and cost use that split; legacy usage without details keeps the previous subtraction/metadata paths. The over-200K tier threshold now includes cache-write tokens. LearningaccountUsageforwardsinputTokenDetailsinto session accounting (and extendsGenerateUsagewithnoCacheTokens). Telemetry comments were updated to match. New unit tests cover the v6 usage shape and learning cost parity.Reviewed by Cursor Bugbot for commit 3267982. Bugbot is set up for automated code reviews on this repo. Configure here.
Summary by cubic
Fixes over-billing for cached Anthropic, Bedrock, and Vertex-Anthropic sessions that charged cached input tokens at the uncached rate on top of cache read/write charges. Closes #1545.
With
ai6 and@ai-sdk/anthropic3,usage.inputTokensis the inclusive total andusage.inputTokenDetailssplits it into uncached, cache-read, and cache-write counts.Session.getUsagestill assumed Anthropic and Bedrock reported only uncached input, so a cached step was billed for the full input twice — about 6x the real cost on cache-heavy sessions.Session.getUsagenow usesinputTokenDetailswhen present; usage without the split keeps the legacy path.accountUsagepassesinputTokenDetailsthrough instead of dropping them.tokens.inputnow reports uncached tokens only;tokens.inputTotalreports the inclusive total.Written for commit 3267982. Summary will update on new commits.
Summary by CodeRabbit