GPT-5.1-Codex Mini
OpenAI · text, image → text
GPT-5.1 Codex mini is a smaller, more cost-effective, less-capable version of GPT-5.1-Codex.
Input$0.25 /M
Output$2.00 /M
← ModelsGPT-5.1-Codex Mini
Grok 4.5
GPT-5.1-Codex Mini vs Grok 4.5
Output tokens cost $2.00 per million on GPT-5.1-Codex Mini and $6.00 per million on Grok 4.5. Input tokens cost $0.25 per million on GPT-5.1-Codex Mini and $2.00 per million on Grok 4.5. Cached input tokens are billed at $0.03 per million on GPT-5.1-Codex Mini and $0.50 per million on Grok 4.5. Context lengths are 400,000 tokens on GPT-5.1-Codex Mini and 500,000 tokens on Grok 4.5. Time to first token (TTFT) measured on AIHubMix is 0.7s on GPT-5.1-Codex Mini and 1.8s on Grok 4.5. Measured output throughput is 168.1 tok/s on GPT-5.1-Codex Mini and 26.6 tok/s on Grok 4.5.
GPT-5.1-Codex MiniGrok 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-5.1-Codex Mini
Grok 4.5
Input /M
$0.25
$2.00
Output /M
$2.00
$6.00
Cache read /M
$0.03
$0.50
Context length
400,000
500,000
Max output
128,000
500,000
Time to First Token
0.7 s
1.8 s
Throughput
168.1 tok/s
26.6 tok/s
Modalities
textimage
textimage
Supported Parameters
thinkingfunction callingstructured outputs
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-minigrok-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-minigrok-4.5
Throughput (tok/s)
-
TTFT (s)
-
Uptime (%)
-
LMArena Benchmarks
LMArena ratings by capability (Bradley-Terry, commonly called Elo). Higher is better.
WebDev Arena
gpt-5.1-codex-minigrok-4.5
12201320142015201620
Overall
12401556
React
15591559
HTML
12481577
Gaming
15861586
Simulations
15981598
Data analytics
15221522
Source: LMArena (arena.ai) leaderboard, imported by AIHubMix. Models without published ratings are omitted per chart.
Cost calculator
Estimate your monthly bill for the same workload on each model.
GPT-5.1-Codex Mini
$45.00 /mo
Grok 4.5
$210 /mo
Monthly = daily × 30. Discounted rates applied where a promotion is active.
FAQ
Which is cheaper: GPT-5.1-Codex Mini, Grok 4.5?
GPT-5.1-Codex Mini: $2.00/M output tokens; Grok 4.5: $6.00/M. Use the cost calculator above to estimate your own workload.
Which responds faster?
GPT-5.1-Codex Mini: 0.7s 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-5.1-Codex Mini 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 Mini and 500,000 tokens on Grok 4.5.
Which one generates tokens faster?
GPT-5.1-Codex Mini at 168.1 tok/s and Grok 4.5 at 26.6 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-5.1-Codex Mini accepts text and image input and supports thinking, 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-5.1-Codex Mini 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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