feat: Add Modal as a built-in provider (free GLM-5 access)

[chindris-mihai-alexandru]

Summary

Modal recently partnered with Z.ai to host GLM-5, a 745B parameter frontier open-source MoE model, via an OpenAI-compatible API endpoint. GLM-5 is available for free until April 30th, 2026.

Proposal

Add Modal as a built-in provider in ForgeCode so users can access GLM-5 directly:

• Provider ID: modal
• API endpoint: https://api.us-west-2.modal.direct/v1/chat/completions
• Model: zai-org/GLM-5-FP8 (745B params, 192K context, MIT license)
• Auth: API key (token from modal.com/glm-5-endpoint)
• Response type: OpenAI-compatible

Why This Matters

• GLM-5 matches frontier proprietary models on coding/agent benchmarks
• Free access through April 2026 — great for ForgeCode users to try
• Modal's endpoint is OpenAI-compatible, making integration trivial
• Already integrated with Claude Code, OpenCode, and Vercel AI SDK

References

• Modal Blog: Try GLM-5
• Modal GLM-5 Endpoint
• Z.ai Benchmarks

PR

Implementation PR: forthcoming

🌸 Generated with AdaL

[chindris-mihai-alexandru]

Implementation PR: #2871

Co-Authored-By: ForgeCode noreply@forgecode.dev