GPT-4o-mini vs Grok 3 Mini Fast
API pricing, context window and capabilities for GPT-4o-mini and Grok 3 Mini Fast, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.
Verdict
computed from the published numbersGPT-4o-mini wins on price. Benchmark data is unavailable for one or both models.
Price
GPT-4o-mini
Terminal-Bench
Not called
Intelligence
Not called
Context window
Tied
Key takeaways
who wins on what, from the published numbersGPT-4o-mini wins
- Cheaper input ($0.15 vs $0.60 /1M)
- Cheaper output ($0.60 vs $2.50 /1M)
- More serving providers (6 vs 3)
- Supports vision
- Supports prompt caching
- Supports structured output
Grok 3 Mini Fast wins
- Higher max output (16K vs 131K)
Cheaper overall
GPT-4o-mini
$0.15 + $0.60 /1M
Larger context
Tied
More providers
GPT-4o-mini
6 providers
Pricing & specs
cheapest listed route · per 1M tokensOn-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower.
| GPT-4o-mini | Grok 3 Mini Fast | |
|---|---|---|
| Input $/1M | $0.15via OpenAI best | $0.60via OCI |
| Output $/1M | $0.60via OpenAI best | $2.50via xAI |
| Context window | 131K | 131K |
| Max output | 16K | 131K best |
| Serving providers | 6 best | 3 |
| Date | Released Jul 18, 2024 | First listed Jun 2025 |
Benchmarks
Benchmark scores, side by side| GPT-4o-mini | Grok 3 Mini Fast | |
|---|---|---|
| Intelligence | 6.7 | Not available |
| Terminal-Bench | 6% | Not available |
| GPQA Diamond | 43% | Not available |
| Output speed | 120 t/s | Not available |
| Latency (TTFT) | 0.84s | Not available |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
GPT-4o-mini
via Gmi
$1.35
Grok 3 Mini Fast
via OCI
$7.00
Capabilities
feature support, side by side| Feature | GPT-4o-mini | Grok 3 Mini Fast |
|---|---|---|
| Vision | ✓ | — |
| Tool use | ✓ | ✓ |
| Reasoning | — | — |
| Audio | — | — |
| Prompt caching | ✓ | — |
| Structured output | ✓ | — |
| Web search | — | — |
Related comparisons
Frequently asked questions
Which is cheaper, GPT-4o-mini or Grok 3 Mini Fast?
GPT-4o-mini is cheaper for input ($0.15 vs $0.60 per 1M tokens) from OpenAI. GPT-4o-mini is cheaper for output ($0.60 vs $2.50 per 1M tokens) from OpenAI.
What is the context window difference between GPT-4o-mini and Grok 3 Mini Fast?
Both GPT-4o-mini and Grok 3 Mini Fast have about a 131K-token context window.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Sep 22, 2026
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