GPT-5.6 Terra vs Grok 4.5

Price, context and benchmark scores side by side — every number from the live model catalogue.

GPT-5.6 Terraopenai Grok 4.5x-ai
Input / 1M tokens $1.25 $2.00
Output / 1M tokens $7.50 $6.00
1M in + 300K out $3.50 $3.80
Context window 1.1M 500K
Intelligence index 55.0 53.8
Coding index 76.7 72.4
Agentic index 47.4 45.7
Cheapest provider OpenAI xAI
Providers serving it 2 1
Weights Closed Closed
Image input Yes Yes
Tool calling Yes Yes
Reasoning mode Yes Yes
Released Jul 9, 2026 Jul 8, 2026

Which one to pick

Pick GPT-5.6 Terra if…

  • You want the higher general-intelligence score (55.0).
  • Code quality is the priority — it leads on the coding index (76.7).
  • You are running agent loops — higher agentic index (47.4).
  • You need the bigger context window (1.1M).
  • You want provider redundancy: 2 providers serve it.

Pick Grok 4.5 if…

  • Token cost matters: $6.00 per 1M output vs $7.50.

FAQ

Is GPT-5.6 Terra better than Grok 4.5?

GPT-5.6 Terra scores higher on general intelligence (55.0 vs 53.8), while Grok 4.5 is 1.3× cheaper per output token ($6.00 vs $7.50). For code, GPT-5.6 Terra leads (76.7 coding index). GPT-5.6 Terra takes the larger context at 1.1M.

Which is cheaper, GPT-5.6 Terra or Grok 4.5?

Grok 4.5, at $6.00 per 1M output tokens versus $7.50. On a 1M input + 300K output workload that is $3.80 against $3.50.

Can I self-host GPT-5.6 Terra or Grok 4.5?

GPT-5.6 Terra: closed weights, API only. Grok 4.5: closed weights, API only.

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