Grok 4.20 (Reasoning): benchmark scores, price and ranking

Grok 4.20 (Reasoning) from xAI ranks #136 of 743 LLMs on the LLMs Tiger aggregate benchmark score (51.2), based on 1 benchmark results captured up to 2026-10-13.

Organisation: xAI
Type: Frontier model
Open weights: No
Released: 2026-02-17 (source: epoch)
Cheapest API price: $1.25 in / $2.50 out per million tokens (via openrouter, observed 2026-10-13T20:47Z)
Aggregate rank: #136 of 743 (score 51.2)

Across the 1 benchmark where at least ten models are scored, Grok 4.20 (Reasoning) is in the top 10% on 0 and in the top half on 1.

Its cheapest listed input price, $1.25 per million tokens, is lower than that of 26% of the 427 models with a listed price.

Grok 4.20 (Reasoning) benchmark results

Grok 4.20 (Reasoning) benchmark scores, ranked against all models measured on each benchmark
Benchmark	Score	Rank	Source	Captured
ARC-AGI-2	65.1%	#25 of 87	ARC Prize official leaderboard	2026-10-13

About Grok 4.20 (Reasoning)

Grok 4.20 (Reasoning) is a frontier model from xAI. It was released on 2026-02-17, according to Epoch AI. The cheapest API listing we track charges $1.25 per million input tokens and $2.50 per million output tokens, through openrouter. We hold 1 benchmark result for it across 1 area, and none is in the top tenth of its board.

Where Grok 4.20 (Reasoning) stands

On our aggregate score, Grok 4.20 (Reasoning) is #136 of 743 ranked models, in the top quarter. Its score is 51.2; the scale is centred on 50, so it sits 1.2 points above the typical model. That beats 82% of the ranked field. Among the 26 ranked xAI models it is #6. The next one up is Grok 4.5 (high) at 52.0. The next one down is grok-4-1-fast-non-reasoning at 51.0.

Grok 4.20 (Reasoning), benchmark by benchmark

ARC-AGI-2 puts Grok 4.20 (Reasoning) at 65.1%, #25 of 87. That beats 71% of the models tested, but 29.9 points short of GPT-6 Astra (max) (95.0%). The results either side are GLM-5.3-Flash (max) (65.8%) and Claude Opus 4.6 (120K, Low) (64.6%). It covers abstract reasoning, ARC Prize public eval set. The board median is 22.8%, so Grok 4.20 (Reasoning) is 42.4 points above it. Source: ARC Prize official leaderboard, captured 2026-10-13.

Price and value

The median input price across the 427 priced models is $0.500 per million tokens, so Grok 4.20 (Reasoning) costs more than the typical listing. Models that score within 1.5 points or better and cost less: DeepSeek V4 Flash 0731 (max) ($0.016, 53.1), Qwen3.7 Flash ($0.030, 50.5), GLM-5.2 (high) ($0.060, 51.6). Similar scores cost more on glm-5p1 ($1.40) and gemini-3.5-flash-high ($1.50).

Release history

The xAI model released before it was grok-4.20-0309-reasoning on 2026-02-17, which scores 49.6. The next one was grok-4.3 (high) on 2026-04-17, at 48.9.

Reading these numbers

The 1 score on this page comes from 1 source: ARC Prize official leaderboard (1). 1 of them come from an official leaderboard and 0 from datasets or third-party runs. With 1 results the aggregate rank can move a lot when one new score arrives.