x-ai

Grok 4.20

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CAPABILITY & COST

What else is worth comparing?

Grok 4.20152.1ECI pointsEpoch Capabilities Index · 2026-10-24
$1.8751M input + 250k output tokens
ECI interval 149.6–154.5 · estimates can overlap
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This modelSelected alternativesOther dots: models with both score and price
Compare specifications for this selection

ECI points are estimates, not percentages. Overlapping intervals do not establish a winner. Nearby score does not mean equivalent capability.

INDEPENDENT EVALUATIONS

Results in context

Where does it sit?

Five nearest ECI estimates · current snapshot, not release-time scores.

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Overlapping intervals do not establish a clear winner. ECI combines source-selected benchmarks; points are not percentages. Snapshot 2026-10-24.

Test by test

No approved benchmark evaluation is linked to this exact model ID. Another version’s score is not substituted.

Each row is a different test, not a common difficulty scale. “Max” does not mean equal compute across providers.

What changes your bill?

Illustrative token baskets, not measured tasks.

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Short exchange1K input + 250 output tokens$0.0019
Long answer4K input + 4K output tokens$0.015
Document analysis100K input + 2K output tokens$0.13
Repeated workload1M input + 250K output tokens$1.875

List prices, captured 2026-10-25. Excludes caching, batch discounts, tools and retries. Token baskets are not estimates of a specific task’s token use.

Within the same developer

Five lowest listed workload costs, plus this model.

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Fixed basket: 1M input + 250k output. Logarithmic positions; labels show actual USD. Lower cost does not imply equivalent capability.

PUBLISHED LIMITS

Room to read
Room to respond

Context and maximum output are separate limits, not a quality score. They are not added together.

Context window2Mtokens
Maximum output1.8Mtokens

Published specifications

Context window2Mtokens
API input price$1.25USD / million tokens
API output price$2.5USD / million tokens
Maximum output1.8Mmaximum tokens per response
Output modalitiestextpublished output types
Supported parameters12API parameters listed

Model information

Provider
x-ai
Input modalities
text, image, file
Output modalities
text
Maximum output
1,800,000 tokens
Supported parameters
include_reasoning, logprobs, max_tokens, reasoning, response_format, seed, structured_outputs, temperature, tool_choice, tools, top_logprobs, top_p
Added to catalogue
2026-03-31
Knowledge cutoff
2025-09-01
Catalogue snapshot
2026-10-25

Prices are per million tokens. The workload estimate uses 1,000 input and 250 output tokens. Context describes request capacity, not model quality.

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