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GPT-5.1-Codex Max vs Grok 4.5

Compare GPT-5.1-Codex Max from OpenAI and Grok 4.5 from Grok on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the AIHubMix API.

OpenAIGPT-5.1-Codex MaxGrokGrok 4.5
+ Add model · 2/4
OpenAI logo
GPT-5.1-Codex Max
OpenAI · text, image → text

GPT-5.1-Codex-Max is a frontier programming model built for the agent-driven era. Powered by an upgraded core reasoning architecture, it is specially trained for complex agentic tasks in software engineering, mathematics, and scientific research. It delivers faster performance, greater stability, and higher token efficiency across the entire development lifecycle, including code generation, refactoring, debugging, and engineering collaboration. With native support for multiple context windows and a built-in compaction mechanism, the model can coherently process millions of tokens within a single task.

Input$1.25 /M
Output$10 /M
Cache read$0.125 /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 /M
Output$6 /M
Cache read$0.5 /M
Details

Pricing & Specifications

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

GPT-5.1-Codex Max
Grok 4.5
Input /M
$1.25
$2
Output /M
$10
$6
Cache read /M
$0.125
$0.5
Context length
400,000
500,000
Max output
128,000
500,000
Time to First Token
-
3.5 s
Throughput
-
26.5 tok/s
Modalities
textimage
textimage
Supported Parameters
function callingstructured outputsthinking
thinkingtoolsfunction callingstructured outputslong context
API Formats
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-5.1-codex-maxgrok-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-5.1-codex-maxgrok-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-5.1-Codex Max
$225 /mo

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

FAQ

Which is cheaper: GPT-5.1-Codex Max, Grok 4.5?

Grok 4.5: $6/M output tokens; GPT-5.1-Codex Max: $10/M. Use the cost calculator above to estimate your own workload.

How large is each context window?

GPT-5.1-Codex Max accepts 400,000 and Grok 4.5 accepts 500,000 input tokens. Maximum output per request is 128,000 tokens on GPT-5.1-Codex Max and 500,000 tokens on Grok 4.5.

What inputs and capabilities does each model support?

GPT-5.1-Codex Max accepts text and image input and supports function calling, structured outputs and thinking; Grok 4.5 accepts text and image input and supports thinking, tool calling, function calling, structured outputs and long context.

Can I call GPT-5.1-Codex Max 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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