# Buzz Desktop v0.5.1: native Claude/GPT routing, claude-opus-5 support, MCP proxy/TLS passthrough

> Buzz adds native gateway routing for Claude and GPT model families, an explicit claude-opus-5 model config entry, and fixes Anthropic prompt caching when used through Databricks with MCP proxy/TLS passthrough. The desktop app gains inline custom harness creation from agent dialogs, Linux WebKit rendering workarounds, and several UI fixes. The CLI gets a NIP-38 profile status command.

| | |
|---|---|
| **Tool** | Buzz |
| **Version** | v0.5.1 |
| **Kind** | release |
| **Published** | 2026-07-29 |
| **Observed** | 2026-08-22 |
| **Significance** | 3/5 |
| **Breaking** | no |
| **Categories** | feature, model-support, capability, fix |

## What changed


- **Native gateway routing**: Claude and GPT model families are now routed to their respective native gateway wire instead of through a generic proxy
- **claude-opus-5**: Explicit model config entry added
- **Prompt caching fix**: Anthropic prompt caching now works with Databricks, plus MCP proxy/TLS passthrough enabled
- **Custom harness inline**: Add custom harness directly from agent dialogs
- **CLI NIP-38 status**: New `users set-status` command for Nostr profile status
- **Linux**: WebKit rendering workarounds applied at startup
- **Desktop fixes**: stale thread new-message pill cleared, drafts excluded from Inbox All view, inbox icon restored in sidebar, community rail painted full height, shared agent fidelity preserved
- **Performance**: observer-feed archive and decrypt moved off main thread
- **Agent catalog**: Sharing flow refined
- **Codex-ACP**: Gated on a minimum supported version
- **Composer**: Multiline block formatting scoped correctly


## Sources

- [github_release](https://github.com/block/buzz/releases/tag/v0.5.1) — retrieved 2026-08-22


## Community

_No curated reactions recorded. Facts and community takes are kept in separate layers
and never blended._

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Canonical: https://changelogs.info/buzz/v0-5-1
Entity: https://changelogs.info/buzz
Event ID: `evt_2026-07-29_buzz_v0-5-1`
Licence: event synthesis © changelogs.info, CC BY 4.0. Linked sources belong to their vendors.