Description

Anthropic released Claude Sonnet 4.6 today (February 17, 2026). When trying to use it as a model in OpenClaw, it fails with:

[diagnostic] lane task error: error="Error: Unknown model: anthropic/claude-sonnet-4-6"

Running openclaw models list --all confirms the model appears as configured,missing — meaning OpenClaw's internal catalog doesn't include it yet.

Steps to Reproduce

1. Set agents.defaults.model.primary to anthropic/claude-sonnet-4-6 in config
2. Start the gateway: openclaw gateway
3. Send any message
4. Observe error in gateway logs

Expected Behavior

OpenClaw should support anthropic/claude-sonnet-4-6 like other Anthropic models.

Actual Behavior

Error: Unknown model: anthropic/claude-sonnet-4-6

openclaw models list --all shows it as configured,missing — not in the internal model catalog.

Model Info

• Release date: February 17, 2026
• Model ID: claude-sonnet-4-6
• Context: 1M tokens
• Pricing: $3–$15 per million tokens (same as previous Sonnet)
• Anthropic docs: https://www.anthropic.com/news/claude-sonnet-4-6

Environment

• OpenClaw version: 2026.2.15 (3fe22ea)
• OS: macOS 26.2 (arm64)
• Node: 23.11.0

Workaround

Currently using anthropic/claude-opus-4-6 as fallback.

Request

Please add claude-sonnet-4-6 to the Anthropic provider model catalog. 🦞