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## Summary Databricks v2 chooses the gateway wire format — OpenAI Responses, Anthropic Messages, or MLflow chat — purely from substrings in the endpoint name. There is no family field on the endpoint to key off, so the substring set *is* the routing contract. The matcher only recognised `gpt-5`/`gpt5` and `claude`, which makes correct billing depend on every Claude endpoint happening to be named with the literal string "claude". ## Why this matters Getting a Claude model onto the Anthropic Messages route is exactly what lets buzz attach the `cache_control` breakpoint (the fix in #3463). If a Claude endpoint's catalog name omits "claude" — an alias, a bare `opus-5`, a `goose-opus-5` — it silently falls through to the MLflow (OpenAI-wire) path, where Anthropic prompt caching is **structurally impossible**. The result is the same failure #3463 fixed: 0% cache reads, the full ~10x read discount lost, and no error — a naming convention quietly holding up a billing-correctness invariant. ## What changed `databricks_v2_route_for_model` (`crates/buzz-agent/src/llm.rs`) now matches broader, case-insensitive marker sets: - **Claude → Anthropic Messages:** `claude`, `opus`, `sonnet`, `haiku`, `mythos`, `fable` — the Claude family names and release code names, so a Claude endpoint reaches the cache-capable route regardless of how it's named. - **GPT → OpenAI Responses:** the `gpt` family (now `gpt` on its own, not just `gpt-5`) plus the GPT-5 launch code names `sol`, `luna`, `terra`. OpenAI markers are evaluated first, preserving the prior `gpt-5`-first precedence for any name that could carry both. Names matching neither set still fall through to the MLflow chat route. ## Testing - `cargo fmt`, `cargo clippy -p buzz-agent --all-targets -- -D warnings` — clean. - `cargo test -p buzz-agent` — all green (299 lib + integration suites, 0 failures). The `databricks_v2_routes_by_model_family` test was expanded to cover each new marker, the GPT-5 code names, case-insensitivity, and the unchanged MLflow fallback (including `gemini`). ## Relationship to #3463 #3463 taught the Anthropic path to request caching; this makes sure Claude models actually land on that path. Follow-up still open: surfacing `cache_creation_input_tokens` end-to-end so a persistent `reads == 0 && writes == 0` reveals a disabled cache regardless of which wire a model takes — happy to do that next. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Signed-off-by: Atish Patel <atish@squareup.com> Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>