GPT 5.6 Terra
OpenAI · text, image → text
GPT-5.6 Terra is designed for workloads that balance intelligence and cost. It roughly corresponds to the mini model tier used in earlier GPT-5 families.
Input$2.00 /M
Output$12.00 /M
← ModelsGPT 5.6 Terra
Grok 4.5
GPT 5.6 Terra vs Grok 4.5
Output tokens cost $12.00 per million on GPT 5.6 Terra and $6.00 per million on Grok 4.5. Input tokens cost $2.00 per million on GPT 5.6 Terra and $2.00 per million on Grok 4.5. Cached input tokens are billed at $0.20 per million on GPT 5.6 Terra and $0.50 per million on Grok 4.5. Context lengths are 1,050,000 tokens on GPT 5.6 Terra and 500,000 tokens on Grok 4.5. Time to first token (TTFT) measured on AIHubMix is 0.8s on GPT 5.6 Terra and 2.2s on Grok 4.5. Measured output throughput is 60.0 tok/s on GPT 5.6 Terra and 27.7 tok/s on Grok 4.5.
GPT 5.6 TerraGrok 4.5+ Add model · 2/4
Grok 4.5
Grok · text, image → text
Grok 4.5 was trained on datasets spanning knowledge in coding, science, engineering, and math. With both intelligent and efficient reasoning, Grok 4.5 excels at real engineering tasks and exceeds comparable leading models at these tasks.
Input$2.00 /M
Output$6.00 /M
Pricing & Specifications
Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.
GPT 5.6 Terra
Grok 4.5
Input /M
$2.00
$2.00
Output /M
$12.00
$6.00
Cache read /M
$0.20
$0.50
Context length
1,050,000
500,000
Max output
128,000
500,000
Time to First Token
0.8 s
2.2 s
Throughput
60.0 tok/s
27.7 tok/s
Modalities
textimage
textimage
Supported Parameters
toolsthinkingstructured outputs
thinkingtoolsfunction callingstructured outputslong context
API Formats
chat_completions · responses
Released
-
July 2026
Promotional prices show the discounted rate; see each model page for promotion windows.
Activity Past 30 Days
Daily traffic served through AIHubMix — how demand for each model is trending.
gpt-5.6-terragrok-4.5
Tokens / day
-
Requests / day
-
Performance Past 3 Days
Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.
gpt-5.6-terragrok-4.5
Throughput (tok/s)
-
TTFT (s)
-
Uptime (%)
-
Cost calculator
Estimate your monthly bill for the same workload on each model.
Grok 4.5
$210 /mo
GPT 5.6 Terra
$300 /mo
Monthly = daily × 30. Discounted rates applied where a promotion is active.
FAQ
Which is cheaper: GPT 5.6 Terra, Grok 4.5?
Grok 4.5: $6.00/M output tokens; GPT 5.6 Terra: $12.00/M. Use the cost calculator above to estimate your own workload.
Which responds faster?
GPT 5.6 Terra: 0.8s time to first token measured on AIHubMix; see the live performance charts above for how each model behaves across the day.
How large is each context window?
GPT 5.6 Terra accepts 1,050,000 and Grok 4.5 accepts 500,000 input tokens. Maximum output per request is 128,000 tokens on GPT 5.6 Terra and 500,000 tokens on Grok 4.5.
Which one generates tokens faster?
GPT 5.6 Terra at 60.0 tok/s and Grok 4.5 at 27.7 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.
What inputs and capabilities does each model support?
GPT 5.6 Terra accepts text and image input and supports tool calling, thinking and structured outputs; Grok 4.5 accepts text and image input and supports thinking, tool calling, function calling, structured outputs and long context.
Can I call GPT 5.6 Terra and Grok 4.5 with the same API key?
Yes. AIHubMix serves every model on this page behind one OpenAI-compatible endpoint, so switching between them is a one-line change to the model field — no second account, key or SDK.
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