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🔭 feat: Support Gemini 4 Argon Input and History Rules - #620
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Gemini 4 Argon accepts image, audio, video and PDF input, but the multimodal check only recognized Gemini 1.5, 2 and 3, so the content converter rejected attachments with "This model does not support images". The check now matches Gemini 3 and any later major version. Argon histories cannot end in a model turn, so gemini-4-argon (and its variants) joins the no-prefill list and a trailing model turn is dropped before the request, as it already is for Flash 3.6+.
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Summary
Gemini 4 Argon (
gemini-4-argon, GA 2026-10-13) hits two predicates in the Google GenAI client that only knew earlier models._isMultimodalModelmatched Gemini 1.5, 2 and 3 only, so an image or PDF attached to an Argon turn was rejected locally with "This model does not support images", although Argon accepts image, audio, video and PDF input. And Argon histories cannot end in amodelturn, butrejectsModelTurnPrefillcovered only Flash 3.6+ and 3.5 Flash-Lite, so a resubmitted assistant turn reached Google and failed with HTTP 400.The multimodal check now matches Gemini 3 and any later major version, and
gemini-4-argon(with prefixed ids and thecyber-permissivevariant) joins the no-prefill list. Needed by LibreChat-AI/LibreChat#17200, which adds first-class Argon support.Change Type
Testing
npx jest src/llm/google/utils/common.test.ts src/llm/google/multimodal.test.ts: 18 passed; with the source change reverted, the two new Argon tests failnpx jest src/llm/google(offline suites, excluding the livellm.spec.ts): 31 passednpx tsc --noEmitand ESLint on the touched files: cleanChecklist