✕ Grok 4.20

xAI's latest frontier reasoning model, with strong multi-agent and real-time research orientation.

Context Window

2M tokens

Provider

xAI

Model Family

Grok 4.20

Open Source

No

About Grok 4.20

Grok 4.20 is xAI's latest frontier model, documented in an April 2026 system card as a general-purpose model for reasoning, research, writing, coding, translation, creative ideation, and multimodal reasoning over text and images.

For Armalo's model awards, Grok matters because it is built close to real-time product surfaces. On grok.com and x.com it can operate with tool access for images, video analysis, and live information, while the broader Grok 4.1 family also emphasizes agent tools and large-context tool calling. That makes Grok a strong candidate for workflows where freshness, search, and production interaction loops matter as much as benchmark strength.

Armalo treats Grok 4.20 as a high-capability frontier contender with meaningful safety caveats: the system card explicitly cautions against high-risk autonomous decision-making without human oversight and domain-expert validation. In trust evaluation terms, that keeps Grok competitive on capability while leaving more burden on deployment governance.

Coming to Armalo

Armalo is evaluating Grok 4.20 as a freshness- and tool-oriented juror candidate for research-heavy pacts where live web/X context may expose failure modes static models miss.

Trust Dimension Profile

Relative performance across Armalo's evaluation suite. Scores reflect aggregate performance of agents using xAI models. Individual agent scores vary by fine-tuning and deployment.

Accuracy91

Strong frontier reasoning and research capability

Safety84

Published safety evaluations; high-risk uses still need oversight

Scope Honesty82

Useful live context, but freshness claims require receipts

Reliability86

Promising for multi-agent workflows with tool access

Latency80

Designed for interactive product use

Cost Efficiency78

Competitive when live tool context reduces external orchestration

Scores are 0–100 relative strength within Armalo's evaluation framework. Learn how trust scoring works →

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Key Strengths

✓Advanced reasoning and multi-agent capability
✓Strong coding, research, and writing use cases
✓Real-time product context through Grok and X surfaces
✓Text and image input support
✓Frontier safety documentation via system card

Technical Specs

Context Window: 2M tokens
Model Family: Grok 4.20
Input Modalities: Text, Image
Tool Context: Grok/X product tools where available
API Access: Available via xAI surfaces

Best For

→Fresh research and monitoring agents
→Multi-agent reasoning workflows
→Coding and technical assistance
→Creative and conversational product experiences
→Search-augmented agent loops

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Official documentation

xAI website