Using 📝Claude Mythos in 📝Cursor requires access to Anthropic's early-access program. As of April 2026, Claude Mythos is not available as a general model selection in Cursor or any other third-party client.
Current Access: Project Glasswing
Claude Mythos is available exclusively through Project Glasswing — Anthropic's invite-only early-access program. There is no public API endpoint, no model ID to select in Cursor's model picker, and no confirmed timeline for general availability.
To check the latest on access, see 📝Claude Mythos Release Date and What We Know So Far.
What You Can Do Now
Use Claude Opus 4.6 in Cursor
📝Cursor 3 supports multi-model selection including Claude Opus 4.6 — the current top-tier Claude model available via API. Opus 4.6 is the model directly below Mythos in Anthropic's lineup and is fully supported in Cursor's chat, autocomplete, and autonomous agent modes.
Connect MythOS to Cursor via MCP
While you wait for Claude Mythos access, you can connect 📝MythOS — the AI-native knowledge platform — to Cursor today. MythOS gives Cursor identity-aware access to your memos, knowledge graph, and RAG-powered library chat through the 📝Model Context Protocol (MCP). This works with any model Cursor supports, including Opus 4.6.
Full setup guide: 📝How to Use MythOS with Cursor.
When Claude Mythos Becomes Available
Once Anthropic opens Claude Mythos to third-party API access, Cursor will likely support it as a model option — Cursor already supports Claude Opus 4.6, Sonnet 4.6, and Haiku via Anthropic's API. The model selection would appear in Cursor's model picker alongside existing options.
Pairing Claude Mythos with MythOS via MCP would give you the frontier model's reasoning capabilities plus persistent, identity-aware context from your knowledge library — the same pattern that currently works with Opus 4.6 and 📝Claude Code.
Related
- 📝Claude Mythos — what Claude Mythos is and what it can do
- 📝What is Claude Mythos AI — quick explainer
- 📝How to Use MythOS with Cursor — connect the MythOS knowledge platform to Cursor today
- 📝Claude Code vs Cursor — comparing the two AI coding surfaces
- 📝Cursor — reference memo on the Cursor editor