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GPT-5.6 Sol vs Grok 4.3 — Price, Context, and Capability Compared

Verdict

GPT-5.6 Sol costs 7.2× 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 GPT-5.6 Sol's edge.

Spec comparison

GPT-5.6 SolGrok 4.3
Price (input)$5.00/M$1.25/M
Price (output)$30.00/M$2.50/M
Blended price$11.25/M$1.56/M
Context window400,000 tokens1,000,000 tokens
Max output128,000 tokens64,000 tokens
Modalitiestext, visiontext, vision
Reasoning modeYesYes
Released2026-062026-06
Speed44 t/s98 t/s

Cost at scale (3:1 blended)

Tokens / monthGPT-5.6 SolGrok 4.3Delta
1,000,000$11.25$1.56$9.69 (7.2×)
10,000,000$112.50$15.63$96.88 (7.2×)
100,000,000$1125.00$156.25$968.75 (7.2×)

Choose GPT-5.6 Sol if…

  • Strongest OpenAI model for agentic, long-horizon coding
  • Deep reasoning mode for multi-step planning
  • Native vision input
  • Complex, multi-step professional and coding work where accuracy matters more than cost.

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

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FAQ

Is GPT-5.6 Sol cheaper than Grok 4.3?

Grok 4.3 is cheaper, at $1.56 per million blended tokens vs $11.25 for GPT-5.6 Sol.

Which has the bigger context window, GPT-5.6 Sol or Grok 4.3?

Grok 4.3 has the larger context window: 1,000,000 tokens vs 400,000.

Can GPT-5.6 Sol replace Grok 4.3 for coding?

Both are viable for coding. Strongest OpenAI model for agentic, long-horizon coding (GPT-5.6 Sol) vs xAI’s general-purpose flagship (Grok 4.3) — pick based on which strength matters more for your workload.

Which is faster, GPT-5.6 Sol or Grok 4.3?

Grok 4.3 is faster: 98 t/s vs 44 t/s, measured on our speed benchmarks.

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