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Grok 4.5 vs GPT Mini (120b)

At a glance
xAIGrok 4.5

xAI's Opus-class flagship for frontier coding, agentic tool use, and knowledge work.

89500K ctx$2.00/$6.00 per M#6/92
OpenAIGPT Mini (120b)

OpenAI's budget-friendly reasoning model — fast and surprisingly capable.

73131K ctx$0.04/$0.18 per M#49/92
AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
xAIGrok 4.5
Reasoning
CI 86.2-90.3
CodingInsufficient data
Sources:Epoch ECI·Epoch AI·Provider·OpenRouter· as of 2026-07-10
Smarter
Capability
CapabilityECI88.5
Reasoning & Knowledge
Graduate Science93.4%Factual Recall53.5%
Math
Competition Math97.8%
Coding
Code Editing—
Agentic
Terminal Tasks83.3%Task Horizon—
OpenAIGPT Mini (120b)
Reasoning
CodingInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Cheaper
Capability
CapabilityECI73.2
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—
Coding
Code Editing41.8%
Agentic
Terminal Tasks18.7%Task Horizon42min
Specs
xAIGrok 4.5
500K
Context
16K
Max output
Jul 2026
Released
OpenAIGPT Mini (120b)
131K
Context
16K
Max output
Aug 2025
Released
Capabilities
xAIGrok 4.5
Vision
Audio
Reasoning
OpenAIGPT Mini (120b)
Vision
Audio
Reasoning
Pricing
xAIGrok 4.5
Live pricing, shown before you run
Input$2.00/M tokens
Output$6.00/M tokens
Cache read$0.50/M tokens
Web search$0.005/search
OpenAIGPT Mini (120b)
Live pricing, shown before you run
Input$0.04/M tokens
Output$0.18/M tokens
Chat with Grok 4.5Go to model
Chat with GPT Mini (120b)Go to model
Frequently Asked Questions: Grok 4.5 vs GPT Mini (120b)▼

Which is better, Grok 4.5 or GPT Mini (120b)?

▼

Based on the Capability Index, Grok 4.5 scores higher (88.5 vs 73.2). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Which is cheaper, Grok 4.5 or GPT Mini (120b)?

▼

GPT Mini (120b) has a lower blended cost. Grok 4.5: $2.00 input / $6.00 output. GPT Mini (120b): $0.04 input / $0.18 output.

Which has a larger context window, Grok 4.5 or GPT Mini (120b)?

▼

Grok 4.5 has a larger context window: Grok 4.5 supports 500K tokens vs GPT Mini (120b) at 131K tokens.

Do both Grok 4.5 and GPT Mini (120b) support vision?

▼

Grok 4.5 supports vision/image input, but GPT Mini (120b) does not.

What are the key differences between Grok 4.5 and GPT Mini (120b)?

▼

Key differences: Grok 4.5 has a notably higher capability index (15.3 point gap); GPT Mini (120b) is significantly cheaper; only Grok 4.5 supports vision input. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both Grok 4.5 and GPT Mini (120b) for free on idapt.app to see which performs better for your specific needs.

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