grok-4.20-0309-non-reasoning

Overview. Grok 4.20 0309 (Non-Reasoning) is xAI's proprietary, closed-weight text+image-to-text model — the fast, non-reasoning variant in the Grok 4.20 line. It skips chain-of-thought generation entirely, returning direct answers instead of a reasoning trace. Developers reach for it when they want vision-capable Inference with tool calling and structured outputs but don't need multi-step reasoning.

Key strengths. The model supports a 1M-token context window, image input alongside text, native function calling, and structured outputs — a solid feature set for building tool-using agents and document-heavy applications. Artificial Analysis's Intelligence Index scores this exact pinned snapshot at 23, ranking it #33 of 64 tracked models: a mid-pack result rather than a frontier-leading one. Its non-reasoning design (no chain-of-thought trace) trades peak benchmark depth for more predictable, lower-overhead responses.

When to use it. Use this model for text-and-image tasks that need reliable tool calling or structured JSON output but don't require deep multi-step reasoning — classification, extraction, straightforward Q&A, or agent steps where response speed matters more than maximum benchmark score. Its 1M-token context window also makes it workable for long-document or long-conversation tasks that stay within medium complexity. For problems that genuinely need chain-of-thought reasoning, xAI's reasoning sibling in the same family is the better fit.

Limitations. As the non-reasoning variant, it produces no reasoning trace, so it is not the right choice for complex multi-step problem-solving. It does not accept or produce audio, and it has no native document-understanding modality beyond text and image input. Its training data cutoff is approximately September 2025.

Sovereignty note. Grok 4.20 0309 (Non-Reasoning) is a proprietary, closed-weight model built by xAI, a US-based creator. No EU data-residency or CLOUD Act mitigation terms are published for this endpoint, so it should not be described as Sovereign.