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Claude Opus 4.8 vs GPT-5.6 Terra — Price, Context, and Capability Compared

Verdict

Claude Opus 4.8 costs 2.2× more per blended million tokens than GPT-5.6 Terra. Claude Opus 4.8 has the larger context window (500,000 tokens). Default to GPT-5.6 Terra unless you specifically need Claude Opus 4.8's edge.

Spec comparison

Claude Opus 4.8GPT-5.6 Terra
Price (input)$5.00/M$2.00/M
Price (output)$25.00/M$12.00/M
Blended price$10.00/M$4.50/M
Context window500,000 tokens400,000 tokens
Max output64,000 tokens128,000 tokens
Modalitiestext, visiontext, vision
Reasoning modeYesYes
Released2026-042026-06
Speed58 t/s78 t/s

Cost at scale (3:1 blended)

Tokens / monthClaude Opus 4.8GPT-5.6 TerraDelta
1,000,000$10.00$4.50$5.50 (2.2×)
10,000,000$100.00$45.00$55.00 (2.2×)
100,000,000$1000.00$450.00$550.00 (2.2×)

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 GPT-5.6 Terra if…

  • Balanced cost-to-intelligence ratio
  • Reasoning mode available on demand
  • Same 400K context as Sol
  • Everyday production workloads that need strong quality without Sol-tier pricing.

Run this exact matchup right now

Send the same prompt to Claude Opus 4.8 and GPT-5.6 Terra side by side and see the outputs yourself.

Try Claude Opus 4.8 vs GPT-5.6 Terra Free

FAQ

Is Claude Opus 4.8 cheaper than GPT-5.6 Terra?

GPT-5.6 Terra is cheaper, at $4.50 per million blended tokens vs $10.00 for Claude Opus 4.8.

Which has the bigger context window, Claude Opus 4.8 or GPT-5.6 Terra?

Claude Opus 4.8 has the larger context window: 500,000 tokens vs 400,000.

Can Claude Opus 4.8 replace GPT-5.6 Terra for coding?

Both are viable for coding. Elite coding and multi-step reasoning (Claude Opus 4.8) vs Balanced cost-to-intelligence ratio (GPT-5.6 Terra) — pick based on which strength matters more for your workload.

Which is faster, Claude Opus 4.8 or GPT-5.6 Terra?

GPT-5.6 Terra is faster: 78 t/s vs 58 t/s, measured on our speed benchmarks.

Related

Claude Opus 4.8 pricingGPT-5.6 Terra pricingvs Grok 4.3vs Gemini 3.1 Provs Claude Opus 4vs Claude Fable 5Premium model tests

Pricing verified 2026-06-07. Specs verified 2026-08-08.