chore(evals): add claude-sonnet-5 pricing to braintrust UI publisher

[miguelg719]

Why

Sonnet 5 eval runs published to the Braintrust UI had no pricing entry, so their cost metrics fell through as unknown.

What changed

Standard (non-introductory) Sonnet 5 rates — $3 input / $0.30 cached / $15 output per 1M — in the publisher's pricing map, prefixed and unprefixed forms per the map's convention.

Deliberate trade-off (noted in the code comment): introductory pricing ($2 / $0.20 / $10) applies through 2026-08-31, so costs published before then are overstated ~1.5×; standard rates keep the dashboard stable across the cutover instead of requiring a September flip.

Tests

Internal publish script; no behavior beyond the map entry. Typecheck green.

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Summary by cubic

Add standard pricing for anthropic/claude-sonnet-5 and claude-sonnet-5 in the Braintrust UI publisher so eval runs get priced instead of showing as unknown. Uses $3 input / $0.30 cached input / $15 output per 1M tokens; this will overstate costs until 2026-08-31 while introductory rates are active, chosen to keep dashboards stable across the cutover.

^{Written for commit 557c354. Summary will update on new commits.}

[changeset-bot]

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[cubic-dev-ai]

No issues found across 1 file

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}