feat: add GLM-Image model via Z.AI provider

[rcogal]

Summary

Adds GLM-Image text-to-image generation model via Z.AI provider with verified pricing and configuration.

Model Details

Property	Value
Model ID	glm-image
Provider	Z.AI
Pricing	$0.015 per image
Context Size	2,000 characters
API Endpoint	/api/paas/v4/images/generations

Implementation

• Added model definition to packages/models/src/models/zai.ts
• Configured with test: "skip" flag to exclude from E2E tests (as requested, due to cost)
• Uses existing Z.AI image generation API infrastructure (already implemented for CogView-4)
• Pricing verified from Z.AI official documentation

Technical Notes

API Support Already Exists

The Z.AI image generation API integration is already fully implemented in the codebase:

• ✅ Endpoint routing: get-provider-endpoint.ts:227-231 routes to /api/paas/v4/images/generations
• ✅ Request preparation: prepare-request-body.ts:232-259 formats image generation requests
• ✅ Response parsing: parse-provider-response.ts:475-496 handles Z.AI image response format

This implementation was created for CogView-4 and works uniformly for all Z.AI image models through provider-based checks (not model-specific logic).

Response Format

Z.AI image API returns:

{
  "created": 1760335349,
  "data": [{"url": "https://..."}],
  "content_filter": [{"role": "assistant", "level": 1}]
}

This format is handled by the existing parser that checks usedProvider === "zai" && json.data.

Configuration Flags

{
  test: "skip",              // Excluded from E2E tests
  imageGenerations: true,    // Routes to image generation API
  output: ["text", "image"], // Image-capable model
  streaming: false,          // Image generation is non-streaming
  requestPrice: 0.015,       // $0.015 per image
}

Test Plan

• Model definition added with correct configuration
• Pricing verified from Z.AI official docs ($0.015/image)
• test: "skip" flag set to exclude from automated E2E tests
• Code formatted with pnpm format
• Production build passes with pnpm build
• Model appears in /v1/models API correctly
• Verified existing Z.AI image generation API handles both CogView-4 and GLM-Image uniformly

Note: Manual testing confirmed the model routes correctly and uses the existing Z.AI image generation infrastructure. Full end-to-end image generation testing was performed once to verify the implementation (as requested, to avoid unnecessary API costs).

Files Changed

• packages/models/src/models/zai.ts - Added GLM-Image model definition

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features

  • Added GLM-Image to the AI model lineup — supports text+image outputs, 2000-token context, up to 4096-token output, priced at $0.015 per request.

• Documentation

  • Updated image-generation docs: added GLM-Image to the models table, adjusted table layout, and clarified CogView-4 description to note embedded-text support.

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[coderabbitai]

Walkthrough

Adds a new GLM-Image model entry to the Z.AI model registry and updates the image-generation docs table and CogView-4 callout to include the new model and note embedded text capabilities.

Changes

Cohort / File(s)	Summary
Z.AI model registry packages/models/src/models/zai.ts	Appended a new glm-image model object to the zaiModels export: id "glm-image", name "GLM-Image", family "glm", outputs ["text","image"], releasedAt: new Date("2025-01-06"), provider zai with modelName: "glm-image", requestPrice: 0.015, contextSize: 2000, maxOutput: 4096, imageGenerations: true.
Docs — image generation feature page apps/docs/content/features/image-generation.mdx	Updated the "Available Z.AI models" table to add zai/glm-image and adjusted CogView-4 description/callout to mention image text-embedding/embedded text rendering.

Sequence Diagram(s)

(omitted)

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• feat(models): add Z AI models and provider integration #566: Adds a "glm-image" entry to the same zaiModels array in packages/models/src/models/zai.ts.
• feat(models): add glm-4.6v-flashx and update prices #1375: Adds GLM model entries to zaiModels (similar family additions; may overlap).
• feat(models): add GLM-4.7 #1346: Appends GLM-family model entries to zaiModels (related model registry edits).

Suggested reviewers

• smakosh

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and concisely describes the primary change: adding a new GLM-Image model through the Z.AI provider, which aligns directly with the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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• apps/docs/content/features/image-generation.mdx

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🔇 Additional comments (2)

apps/docs/content/features/image-generation.mdx (2)

135-138: Clear addition of GLM-Image model details.

The new row is concise and consistent with the existing Z.AI table formatting.

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140-142: Callout clarification reads well.

This phrasing makes the embedded-text capability explicit and easy to understand.

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