Manifest Weekly #09

Claude Code and Anthropic SDK clients can now route through Manifest. Multi-key support landed too, so users with multiple accounts at the same provider can split traffic across them.

What we shipped this week

Route Claude Code through Manifest: Manifest now exposes an Anthropic Messages-compatible endpoint at /v1/messages. Set ANTHROPIC_BASE_URL to your Manifest URL and all Claude Code requests go through routing, fallback, and cost tracking. The agent picker now has a Coding Assistant column with a paste-ready settings.json block.

Multiple API keys per provider: You can now attach up to 5 labeled API keys (or subscription tokens) per provider per agent. Pin specific tiers or fallbacks to a specific key via a compact inline chip on each model row. Users with a personal and work OpenAI key, or two ChatGPT Plus subscriptions, can split traffic without juggling agents.

Fixes

• Tool calls via OpenAI subscription Responses endpoint were silently dropped from response.output (#1817)
• Cost dashboard misattributed fallback rows when primary and fallback used different auth types (#1813)
• Adding a fallback from the same provider with a different auth type silently wiped saved fallbacks (#1825, #1834)
• OpenAI subscription model discovery missed gpt-5.5 due to a stale client version (#1801)
• SDK clients on ChatGPT subscription got 400 unsupported_parameter for standard sampling fields (#1807)
• MiniMax Token Plan activation landed on the homepage instead of the authorize page (#1809)

What’s coming next

• Add Groq as a built-in provider
• Bug fixes to stabilize the product

— The Manifest team