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GPT-5.5 vs Grok Build 0.1

GPT-5.5 (OpenAI) and Grok Build 0.1 (xAI) compared on benchmarks, pricing, context window, and use-case rankings.

Grok Build 0.1 is cheaper on input tokens — $1.00 vs $5.00 per 1M.
GPT-5.5 has a larger context window (1.1M vs 256K tokens).

GPT-5.5OpenAI · 17 in the newsGrok Build 0.1xAI

Scores

Intelligence (ECI)159—

Coding91—

Math97—

Reasoning & Knowledge92—

Agentic & Tools87—

Specifications

DeveloperOpenAIxAI

FamilyGPTGrok

ReleasedApr 23, 2026May 20, 2026

Parameters——

AvailabilityAPI access—

Context window1.1M256K

Price — $/M input$5.00$1.00

Price — $/M output$30.00$2.00

Inputsfile, image, texttext, image

Outputstexttext

Benchmarks

AIME 2024/2025100%—

APEX38%—

ARC-AGI95%—

ARC-AGI-285%—

FrontierMath52%—

FrontierMath Tier 435%—

GPQA Diamond94%—

GSO (code optimization)40%—

Humanity's Last Exam44%—

SciCode56%—

SimpleBench69%—

SimpleQA Verified63%—

SWE-bench Verified81%—

Terminal-Bench85%—

WebDev Arena1505—

WeirdML85%—

τ²-bench94%—

Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.

Frequently asked questions

Which is cheaper, GPT-5.5 or Grok Build 0.1?

Grok Build 0.1 is cheaper on input tokens at $1.00 per million, versus $5.00 (representative OpenRouter pricing).

Which has a larger context window, GPT-5.5 or Grok Build 0.1?

GPT-5.5 supports up to 1.1M tokens, compared with 256K for the other.

Want a different match-up? Open the compare tool to add or swap models.

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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.