fix(anthropic): move (latest) tag from 4.5 to 5 for Opus and Sonnet

[bharadwaj-pendyala]

Summary

• claude-opus-4-5 / claude-sonnet-4-5 showed as (latest) in opencode /models picker while newer Opus 5 / Sonnet 5 exist.
• Moves (latest) display name to the current models per https://docs.anthropic.com/en/docs/about-claude/models (Opus 5 2026-07-24, Sonnet 5 2026-06-30).
• Haiku 4.5 keeps (latest) — no Haiku 5 exists, it is still the current Haiku.

Changes

• models/anthropic/claude-opus-4-5.toml: Claude Opus 4.5 (latest) -> Claude Opus 4.5
• models/anthropic/claude-opus-5.toml: Claude Opus 5 -> Claude Opus 5 (latest)
• models/anthropic/claude-sonnet-4-5.toml: Claude Sonnet 4.5 (latest) -> Claude Sonnet 4.5
• models/anthropic/claude-sonnet-5.toml: Claude Sonnet 5 -> Claude Sonnet 5 (latest)

Verification

• TOML parses cleanly; full bun ./packages/core/script/validate.ts left to CI (no bun locally).
• Cross-checked current lineup vs Anthropic docs: Fable 5.1 / Opus 5 / Sonnet 5 / Haiku 4.5.

[github-actions]

Action items

• [high] [violation] models/anthropic/claude-opus-4-5.toml:1 - Check: (latest) marks undated Anthropic alias IDs, not “newest generation only.” Why: Stripping (latest) from claude-opus-4-5 / claude-sonnet-4-5 conflicts with catalog convention (older undated aliases still use it: claude-opus-4-0, claude-opus-4-1, claude-sonnet-4-0, claude-haiku-4-5) and with Anthropic sync, which always appends (latest) when canonical_id is set (packages/core/src/sync/providers/anthropic.ts, test “labels Anthropic aliases as latest”). Next sync would reintroduce provider-side name = "… (latest)" overrides and undo the lab-only rename. Action: Keep (latest) on the 4.5 undated alias lab entries; only add (latest) to current undated aliases (claude-opus-5, claude-sonnet-5) if those IDs are still floating aliases.
• [high] [violation] providers/anthropic/models/claude-sonnet-5.toml:1 - Check: First-party Anthropic provider must reflect the intended display name (inherit lab name or override it). Why: This file is a full inline definition with hardcoded name = "Claude Sonnet 5" and no base_model, so the lab rename to Claude Sonnet 5 (latest) never reaches the Anthropic host entry users pick. claude-opus-5 already inherits via base_model; Sonnet 5 does not. Action: Point this file at base_model = "anthropic/claude-sonnet-5" (override-only) or set name = "Claude Sonnet 5 (latest)" to match the lab alias label.
• [medium] [possible mistake] providers/requesty/models/claude-opus-4-5@eu.toml:2 - Check: Provider display names that bake in (latest) stay consistent with lab alias naming. Why: These Requesty EU overrides still say Claude Opus/Sonnet 4.5 (latest) (EU) while the PR removes that tag from the shared lab metadata; if the PR’s product intent is “only gen 5 is latest,” these stay wrong, and gen-5 EU rows (claude-opus-5@eu, claude-sonnet-5@eu) still omit (latest). Action: Either leave 4.5 lab (latest) in place (preferred with sync/convention), or update the Requesty EU 4.5/5 display names in the same change so they match the chosen rule.

[bharadwaj-pendyala]

Superseded by #6434, which includes the same strips plus the root fix in sync logic so the tag can't rot again.