Add openrouter support for image/generation endpoints

[Sameerlite]

Relevant issues

Fixes #18961
Fixes #16015

Pre-Submission checklist

Please complete all items before asking a LiteLLM maintainer to review your PR

• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• My PR passes all unit tests on make test-unit
• My PR's scope is as isolated as possible, it only solves 1 specific problem

CI (LiteLLM team)

CI status guideline:

• 50-55 passing tests: main is stable with minor issues.
• 45-49 passing tests: acceptable but needs attention
• <= 40 passing tests: unstable; be careful with your merges and assess the risk.

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• Merge / cherry-pick CI run
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Type

🆕 New Feature

Changes

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Project	Deployment	Review	Updated (UTC)
litellm	Ready	Preview, Comment	Jan 15, 2026 10:17am

[ddkedr]

@Sameerlite on what version this will be available?

[ddkedr]

IDK if you're reading comments in closed issues, so I'll write this here as well

@Sameerlite I thought this might be important to note that nano banana models work fine via chat UI in OpenWebUI (not Image generation module), while the don't work in LiteLLM's Playground in using completions

Also, I don't really understand the logic those models appear in completion list and image generation list in Playground. I have Nano Banana among completion models on one deployment, and in image generation models list on another one

[ddkedr]

@Sameerlite Hi! Do you have any estimates about when this will be merged?

[Sameerlite]

@ddkedr This is already merged

[ddkedr]

@ddkedr This is already merged

In what version?

This is how it looks on 1.81.0

First request was to Seedream 4.5 (no image shown), second Flux Klein (no image shown), 3rd Gemini-2.5-image ended up with an error