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Claude Opus 4.8 vs Grok 4.3 — Price, Context, and Capability Compared

Verdict

Claude Opus 4.8 costs 6.4× more per blended million tokens than Grok 4.3. Grok 4.3 has the larger context window (1,000,000 tokens). Default to Grok 4.3 unless you specifically need Claude Opus 4.8's edge.

Spec comparison

Claude Opus 4.8Grok 4.3
Price (input)$5.00/M$1.25/M
Price (output)$25.00/M$2.50/M
Blended price$10.00/M$1.56/M
Context window500,000 tokens1,000,000 tokens
Max output64,000 tokens64,000 tokens
Modalitiestext, visiontext, vision
Reasoning modeYesYes
Released2026-042026-06
Speed58 t/s98 t/s

Cost at scale (3:1 blended)

Tokens / monthClaude Opus 4.8Grok 4.3Delta
1,000,000$10.00$1.56$8.44 (6.4×)
10,000,000$100.00$15.63$84.38 (6.4×)
100,000,000$1000.00$156.25$843.75 (6.4×)

Choose Claude Opus 4.8 if…

  • Elite coding and multi-step reasoning
  • Strong instruction following on ambiguous prompts
  • Extended-thinking mode
  • Complex, multi-step tasks where Fable 5’s premium isn’t justified.

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 Claude Opus 4.8 and Grok 4.3 side by side and see the outputs yourself.

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FAQ

Is Claude Opus 4.8 cheaper than Grok 4.3?

Grok 4.3 is cheaper, at $1.56 per million blended tokens vs $10.00 for Claude Opus 4.8.

Which has the bigger context window, Claude Opus 4.8 or Grok 4.3?

Grok 4.3 has the larger context window: 1,000,000 tokens vs 500,000.

Can Claude Opus 4.8 replace Grok 4.3 for coding?

Both are viable for coding. Elite coding and multi-step reasoning (Claude Opus 4.8) vs xAI’s general-purpose flagship (Grok 4.3) — pick based on which strength matters more for your workload.

Which is faster, Claude Opus 4.8 or Grok 4.3?

Grok 4.3 is faster: 98 t/s vs 58 t/s, measured on our speed benchmarks.

Related

Claude Opus 4.8 pricingGrok 4.3 pricingvs Gemini 3.1 Provs Claude Opus 4vs Claude Fable 5vs GPT-5.6 TerraPremium model tests

Pricing verified 2026-05-19. Specs verified 2026-08-08.