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Use a Fireworks open model directly when you want Fireworks to serve every turn. FireConnect automatically registers the coding-ready catalog when you connect a harness.

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Start with auto

auto chooses from frontier open models for each new user turn. It is the default on a standard Fireworks key. Use auto-instant when you want a latency-first open-model mix. If fast models are disabled by model governance, use auto.
Restart Claude Code, open /model, and select Auto. No --model flag is required.

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Choose a family, tier, or version

Use --model only when you want a specific family, tier, or version:
Prefer *-latest unless you need a pinned version.

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Find a model ID

The catalog is cached for one hour. --refresh fetches the latest copy.

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Check image support

glm-latest and glm-fast-latest are text-only. Image support for other aliases depends on the model currently behind each alias. Check fireconnect model list before sending images. If an image reaches a text-only model in Claude Code, use /rewind or switch to a vision-capable model such as Kimi or glm-5p3-flash.

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Use US-only models

Use the current model IDs, endpoint, and pricing guidance from US-only Serverless.

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Pricing

Open models bill to your Fireworks account at Serverless Pricing. For per-session estimates and account usage, see Usage and Cost.