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Claude Sonnet 4.6 vs Grok-4.20 Reasoning — Price, Context, and Capability Compared

Verdict

Claude Sonnet 4.6 costs 2.0× more per blended million tokens than Grok-4.20 Reasoning. Grok-4.20 Reasoning has the larger context window (1,000,000 tokens). Default to Grok-4.20 Reasoning unless you specifically need Claude Sonnet 4.6's edge.

Spec comparison

Claude Sonnet 4.6Grok-4.20 Reasoning
Price (input)$3.00/M$2.00/M
Price (output)$15.00/M$6.00/M
Blended price$6.00/M$3.00/M
Context window300,000 tokens1,000,000 tokens
Max output64,000 tokens64,000 tokens
Modalitiestext, visiontext, vision
Reasoning modeYesYes
Released2026-032026-03
Speed76 t/s52 t/s

Cost at scale (3:1 blended)

Tokens / monthClaude Sonnet 4.6Grok-4.20 ReasoningDelta
1,000,000$6.00$3.00$3.00 (2.0×)
10,000,000$60.00$30.00$30.00 (2.0×)
100,000,000$600.00$300.00$300.00 (2.0×)

Choose Claude Sonnet 4.6 if…

  • Best intelligence-per-dollar in the Claude lineup
  • Fast enough for interactive coding agents
  • Reliable structured output
  • Enterprise workloads that need Opus-adjacent quality at Sonnet pricing.

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.

Run this exact matchup right now

Send the same prompt to Claude Sonnet 4.6 and Grok-4.20 Reasoning side by side and see the outputs yourself.

Try Claude Sonnet 4.6 vs Grok-4.20 Reasoning Free

FAQ

Is Claude Sonnet 4.6 cheaper than Grok-4.20 Reasoning?

Grok-4.20 Reasoning is cheaper, at $3.00 per million blended tokens vs $6.00 for Claude Sonnet 4.6.

Which has the bigger context window, Claude Sonnet 4.6 or Grok-4.20 Reasoning?

Grok-4.20 Reasoning has the larger context window: 1,000,000 tokens vs 300,000.

Can Claude Sonnet 4.6 replace Grok-4.20 Reasoning for coding?

Both are viable for coding. Best intelligence-per-dollar in the Claude lineup (Claude Sonnet 4.6) vs State-of-the-art document analysis at 1M context (Grok-4.20 Reasoning) — pick based on which strength matters more for your workload.

Which is faster, Claude Sonnet 4.6 or Grok-4.20 Reasoning?

Claude Sonnet 4.6 is faster: 76 t/s vs 52 t/s, measured on our speed benchmarks.

Related

Claude Sonnet 4.6 pricingGrok-4.20 Reasoning pricingvs Grok 4.3vs Gemini 3.1 Provs Claude Sonnet 4vs Claude Sonnet 4.5Premium model tests

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