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GPT 5 Pro vs Grok 4.5

Output tokens cost $120.00 per million on GPT 5 Pro and $6.00 per million on Grok 4.5. Input tokens cost $15.00 per million on GPT 5 Pro and $2.00 per million on Grok 4.5. Cached input tokens are billed at $15.00 per million on GPT 5 Pro and $0.50 per million on Grok 4.5. Context lengths are 400,000 tokens on GPT 5 Pro and 500,000 tokens on Grok 4.5. Time to first token (TTFT) measured on AIHubMix is 313.1s on GPT 5 Pro and 2.0s on Grok 4.5. Measured output throughput is 8.6 tok/s on GPT 5 Pro and 26.5 tok/s on Grok 4.5.

OpenAIGPT 5 ProGrokGrok 4.5
+ Add model · 2/4
OpenAI logo
GPT 5 Pro
OpenAI · text, image → text

GPT-5 pro uses more compute to think harder and provide consistently better answers. GPT-5 pro is available in the Responses API only to enable support for multi-turn model interactions before responding to API requests, and other advanced API features in the future. Since GPT-5 pro is designed to tackle tough problems, some requests may take several minutes to finish. To avoid timeouts, try using background mode. As our most advanced reasoning model, GPT-5 pro defaults to (and only supports) reasoning.effort: high. GPT-5 pro does not support code interpreter.

Input$15.00 /M
Output$120.00 /M
Details
Grok logo
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
Details

Pricing & Specifications

Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.

GPT 5 Pro
Grok 4.5
Input /M
$15.00
$2.00
Output /M
$120.00
$6.00
Cache read /M
$15.00
$0.50
Context length
400,000
500,000
Max output
128,000
500,000
Time to First Token
313.1 s
2.0 s
Throughput
8.6 tok/s
26.5 tok/s
Modalities
textimage
textimage
Supported Parameters
thinkingtoolsfunction callingstructured outputs
thinkingtoolsfunction callingstructured outputslong context
API Formats
Released
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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-progrok-4.5

Tokens / day

-

Requests / day

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Performance Past 3 Days

Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.

gpt-5-progrok-4.5

Throughput (tok/s)

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TTFT (s)

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Uptime (%)

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Cost calculator

Estimate your monthly bill for the same workload on each model.

Grok 4.5
$210 /mo
GPT 5 Pro
$2,700 /mo

Monthly = daily × 30. Discounted rates applied where a promotion is active.

FAQ

Which is cheaper: GPT 5 Pro, Grok 4.5?

Grok 4.5: $6.00/M output tokens; GPT 5 Pro: $120.00/M. Use the cost calculator above to estimate your own workload.

Which responds faster?

Grok 4.5: 2.0s 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 Pro accepts 400,000 and Grok 4.5 accepts 500,000 input tokens. Maximum output per request is 128,000 tokens on GPT 5 Pro and 500,000 tokens on Grok 4.5.

Which one generates tokens faster?

Grok 4.5 at 26.5 tok/s and GPT 5 Pro at 8.6 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 Pro accepts text and image input and supports thinking, tool calling, function calling 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 Pro 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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