Add claude-opus-4-8 to pricing matrix

[willwashburn]

Summary

Adds a claude-opus-4-8 entry to the vendored models.dev snapshot so cost reporting recognizes Claude Opus 4.8. The entry is added under the canonical anthropic provider (the snapshot compiled into the SDK via include_str!).

Pricing

Mirrors the claude-opus-4-7 entry, which matches the shared Opus 4.5/4.6/4.7 tier:

Field	Value (per Mtok)
input	$5
output	$25
cache_read	$0.5
cache_write	$6.25
context	1,000,000
output limit	128,000

Why these numbers

Opus 4.5, 4.6, and 4.7 all share identical rates in the snapshot, so this follows the established pattern rather than guessing a new tier. There is no official models.dev data for 4.8 yet (pnpm run pricing:update pulls from models.dev, which doesn't list it), so the entry was added manually. The pricing table is keyed by model id with last-provider-wins, so a single canonical anthropic entry is enough to resolve claude-opus-4-8.

Note

If Opus 4.8's real list price differs from the 4.5–4.7 tier, the cost block should be updated with the correct numbers.

Verification

• JSON round-trips and the entry lands only under the anthropic provider.
• SDK + CLI build clean.
• analyze:: test suite (pricing/cost) passes: 319 passed, 0 failed.

https://claude.ai/code/session_01X7HuKZV8ArVVeJBEkTW2L9

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: e595a232-16e7-47a5-9480-d71bd167d9a3

📥 Commits

Reviewing files that changed from the base of the PR and between d3b0e33 and ba790bf.

📒 Files selected for processing (1)

• crates/relayburn-sdk/data/models.dev.json

📝 Walkthrough

Walkthrough

Updates the vendored models.dev pricing snapshot to include claude-opus-4-8 (documented in CHANGELOG) and adds test assertions verifying the bundled pricing table contains claude-opus-4-8 with expected input/output and cache rates.

Changes

Pricing Model Snapshot Documentation & Tests

Layer / File(s)	Summary
Builtin pricing test assertions crates/relayburn-sdk/src/analyze/pricing.rs	Test loads the built-in pricing snapshot and asserts claude-opus-4-8 has the expected input, output, cache_read, and cache_write rates.
Opus 4.8 pricing snapshot update changelog entry CHANGELOG.md	Unreleased changelog documents that the vendored models.dev snapshot now includes claude-opus-4-8 with specified input/output token rates and cache read/write pricing.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• AgentWorkforce/burn#390: Also updates bundled models.dev pricing snapshot and extends pricing assertions in pricing.rs.
• AgentWorkforce/burn#304: Related changes to the bundled pricing snapshot/loader pipeline and snapshot vendoring.
• AgentWorkforce/burn#388: Prior edits around load_builtin_pricing and snapshot parsing that touch the same test and snapshot areas.

Poem

🐰 A tiny hop, a price in sight,
Opus 4.8 joins the ledger bright.
Tests nod yes, the changelog sings,
Tokens counted, cache and things.
Rabbits cheer for tidy springs!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding a claude-opus-4-8 entry to the pricing matrix/models.dev snapshot.
Description check	✅ Passed	The description is comprehensive and directly related to the changeset, explaining the rationale, pricing values, and verification steps taken.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/zen-volta-Pl6JG

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🧹 Nitpick comments (1)

CHANGELOG.md (1)

9-9: 💤 Low value

Consider condensing the pricing details.

The entry includes specific pricing numbers ($5/$25 per Mtok input/output, $0.5 cache-read, $6.25 cache-write, 1M context) that could be considered implementation backstory. As per coding guidelines, changelog entries should prefer concise, impact-first bullets that name what was touched and the practical effect.

♻️ Suggested condensed version

-- Pricing: added `claude-opus-4-8` to the vendored models.dev snapshot ($5/$25 per Mtok input/output, $0.5 cache-read, $6.25 cache-write, 1M context) so cost reporting recognizes Claude Opus 4.8.
+- Pricing: added `claude-opus-4-8` to the vendored models.dev snapshot so cost reporting recognizes Claude Opus 4.8.

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@CHANGELOG.md` at line 9, Replace the verbose pricing breakdown with a
concise, impact-first changelog bullet: keep the subject "claude-opus-4-8" and
the action ("added to the vendored models.dev snapshot") and the practical
effect ("cost reporting recognizes Claude Opus 4.8"), but remove the specific
dollar amounts and technical backstory (e.g., "$5/$25 per Mtok",
cache-read/write fees, "1M context"); update the line referencing
claude-opus-4-8 accordingly so the entry is short and focused on impact.

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Nitpick comments:
In `@CHANGELOG.md`:
- Line 9: Replace the verbose pricing breakdown with a concise, impact-first
changelog bullet: keep the subject "claude-opus-4-8" and the action ("added to
the vendored models.dev snapshot") and the practical effect ("cost reporting
recognizes Claude Opus 4.8"), but remove the specific dollar amounts and
technical backstory (e.g., "$5/$25 per Mtok", cache-read/write fees, "1M
context"); update the line referencing claude-opus-4-8 accordingly so the entry
is short and focused on impact.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: f292ee5a-f230-4d1e-a647-f1aea4149963

📥 Commits

Reviewing files that changed from the base of the PR and between e2598a7 and da107b4.

📒 Files selected for processing (2)

• CHANGELOG.md
• crates/relayburn-sdk/data/models.dev.json

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No issues found across 2 files

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