Anthropic's Code with Claude Developer Conference Is Today — And a New Model Could Be Waiting
Anthropic's developer conference kicks off in San Francisco on May 6. Workshops, live demos, and office hours with the Claude Code and API teams. The leaked model codename 'Jupiter-v1-p' and the Sonnet 4.8 references from March's npm leak both point to a model announcement.
Anthropic is running its Code with Claude developer conference in San Francisco today, May 6. The event is a full day of technical workshops, live capability demos, and one-on-one office hours with the engineers behind Claude Code and the Claude API. It’s also being livestreamed for those not in the room.
It’s the first time the event has expanded to multiple cities. London follows on May 19, Tokyo on June 10. An extended San Francisco session runs on May 7 as well.
What the Event Covers
The format is hands-on. Sessions are led by Anthropic engineers and focused on practical implementation of agentic AI in real development workflows. Confirmed speakers include Ami Vora (Head of Product), Boris Cherny (Head of Claude Code), and Angela Jiang (Product Lead for the Claude API and SDKs).
Topics are centered on how to build with Claude, not just what Claude can do. Past iterations of the event have focused on multi-agent patterns, prompt engineering for code, and tool use via the API.
Model Speculation
The conference is a natural venue for a model announcement, and there are two data points pointing that way.
The first is from March 31, when a source map file accidentally shipped inside the @anthropic-ai/claude-code v2.1.88 npm package. The file contained over 512,000 lines of TypeScript and included references to a model called “Sonnet 4.8,” alongside internal benchmark notes suggesting a +12 point improvement on coding benchmarks over Sonnet 4.7 — roughly three times the gain typical of a quarterly model revision. It also referenced a new “X-high” reasoning effort tier sitting above the current maximum. The leak was widely reported and Anthropic did not dispute its contents.
The second is from Testing Catalog, which reported that a model internally codenamed “Jupiter-v1-p” entered red teaming around May 1. Anthropic has historically used planetary codenames in the weeks before public releases — “Neptune” was used before the Claude 4 family launch at last year’s developer event. Jupiter being the largest body in the solar system has prompted speculation about the scope of what’s coming, though nothing is confirmed.
Sonnet 4.7 came out roughly four weeks after Opus 4.7. If the same pattern holds, and if what’s in the source map reflects what’s actually shipping, a Sonnet 4.8 reveal today fits the timeline.
How to Watch
Livestream registration is at claude.com/code-with-claude/register-livestream. Sessions will also be recorded and made available after the event.
Sources: Code with Claude official page, Anthropic blog announcement, Testing Catalog — Jupiter-v1-p, Kuber Studio — npm source map leak, NxCode — Sonnet 4.8 overview