token.app › Compare › Claude Opus 5 (Fast) vs GPT-5.6 Terra

Claude Opus 5 (Fast) vs GPT-5.6 Terra

GPT-5.6 Terra is 8.9× cheaper per token on a blended 3:1 basis. GPT-5.6 Terra accepts the larger context window (1.1M).

Head to head
Blended price uses a 3:1 input:output mix
Claude Opus 5 (Fast)GPT-5.6 Terra
ProviderAnthropicOpenAI
Input $/1M$10.00$1.00
Output $/1M$50.00$6.00
Blended $/1M$20.00$2.25
Context window1M1.1M
Max output128K128K
ReleasedJul 2026Jul 2026
LicenceProprietaryProprietary
Choose Claude Opus 5 (Fast) if…
  • Newer model (released Jul 2026)
Choose GPT-5.6 Terra if…
  • Costs less per token — $2.25 vs $20.00 blended
  • Larger context window (1.1M)
FAQ
Which is better, Claude Opus 5 (Fast) or GPT-5.6 Terra?
We do not hold independently-run benchmark scores covering both Claude Opus 5 (Fast) and GPT-5.6 Terra, so we make no quality claim. Their pricing and specifications are compared on this page.
Is Claude Opus 5 (Fast) cheaper than GPT-5.6 Terra?
GPT-5.6 Terra is cheaper: $2.25 versus $20.00 per million tokens blended at 3:1 input:output. Input alone: $10.00 vs $1.00. Output alone: $50.00 vs $6.00.
What context windows do Claude Opus 5 (Fast) and GPT-5.6 Terra have?
Claude Opus 5 (Fast): 1,000,000 tokens. GPT-5.6 Terra: 1,050,000 tokens.
Who makes Claude Opus 5 (Fast) and GPT-5.6 Terra?
Claude Opus 5 (Fast) is made by Anthropic. GPT-5.6 Terra is made by OpenAI.
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