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Grok-4.20 Reasoning vs Grok 4.3 — Price, Context, and Capability Compared

Verdict

Grok-4.20 Reasoning costs 1.9× more per blended million tokens than Grok 4.3. Grok-4.20 Reasoning has the larger context window (1,000,000 tokens). Default to Grok 4.3 unless you specifically need Grok-4.20 Reasoning's edge.

Spec comparison

Grok-4.20 ReasoningGrok 4.3
Price (input)$2.00/M$1.25/M
Price (output)$6.00/M$2.50/M
Blended price$3.00/M$1.56/M
Context window1,000,000 tokens1,000,000 tokens
Max output64,000 tokens64,000 tokens
Modalitiestext, visiontext, vision
Reasoning modeYesYes
Released2026-032026-06
Speed52 t/s98 t/s

Cost at scale (3:1 blended)

Tokens / monthGrok-4.20 ReasoningGrok 4.3Delta
1,000,000$3.00$1.56$1.44 (1.9×)
10,000,000$30.00$15.63$14.38 (1.9×)
100,000,000$300.00$156.25$143.75 (1.9×)

Choose Grok-4.20 Reasoning if…

  • State-of-the-art document analysis at 1M context
  • Dedicated reasoning mode
  • Strong vision understanding
  • Long-document analysis and problems that benefit from explicit reasoning.

Choose Grok 4.3 if…

  • xAI’s general-purpose flagship
  • Extremely fast for its size
  • 1M-token context
  • General-purpose work where speed and a huge context window both matter.

Run this exact matchup right now

Send the same prompt to Grok-4.20 Reasoning and Grok 4.3 side by side and see the outputs yourself.

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FAQ

Is Grok-4.20 Reasoning cheaper than Grok 4.3?

Grok 4.3 is cheaper, at $1.56 per million blended tokens vs $3.00 for Grok-4.20 Reasoning.

Which has the bigger context window, Grok-4.20 Reasoning or Grok 4.3?

Both models support 1,000,000 tokens of context.

Can Grok-4.20 Reasoning replace Grok 4.3 for coding?

Both are viable for coding. State-of-the-art document analysis at 1M context (Grok-4.20 Reasoning) vs xAI’s general-purpose flagship (Grok 4.3) — pick based on which strength matters more for your workload.

Which is faster, Grok-4.20 Reasoning or Grok 4.3?

Grok 4.3 is faster: 98 t/s vs 52 t/s, measured on our speed benchmarks.

Related

Grok-4.20 Reasoning pricingGrok 4.3 pricingvs Claude Opus 4.8vs Gemini 3.1 Provs GPT-5.6 Terravs Claude Sonnet 4.6Premium model tests

Pricing verified 2026-04-06. Specs verified 2026-08-08.