API cost decision in 10 seconds

Grok 4.20 vs o3 Mini

Pick Grok 4.20 when budget and context both matter.

Page updated:  Data confirmed:  Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Grok 4.20 when budget and context both matter.

On the standard 1M input plus 500K output workload, Grok 4.20 is estimated at $2.5 vs $3.3 for o3 Mini, saving $0.8 (24.2% lower).

Cost-first pickGrok 4.20
Context-first pickGrok 4.20
Sample savings$0.824.2%
10x traffic gap$8

Grok 4.20 is cheaper on the standard workload and also has the larger context window. At 10x that traffic, the same price gap is about $8. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

Grok 4.20 stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shapeToken mixBetter pickGrok 4.20o3 Mini
Input-heavy / RAG5M input + 500K outputGrok 4.20$7.5$7.7
Balanced workload1M input + 1M outputGrok 4.20$3.75$5.5
Output-heavy chatbot1M input + 5M outputGrok 4.20$13.75$23.1
Cheaper input o3 Mini $1.25 vs $1.1 / 1M

o3 Mini is $0.15 cheaper per 1M input tokens (12% lower; 1.14x difference).

Cheaper output Grok 4.20 $2.5 vs $4.4 / 1M

Grok 4.20 is $1.9 cheaper per 1M output tokens (43.2% lower; 1.76x difference).

Larger context Grok 4.20 2M vs 200K

Grok 4.20 has 1.8M more context (10x larger).

Sample workload Grok 4.20 $2.5 vs $3.3

Grok 4.20 is $0.8 cheaper on the standard workload (24.2% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.
Grok 4.20 Calculating… Estimated API cost
o3 Mini Calculating… Estimated API cost
Cheaper for this workload Calculating… Difference: calculating…

This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.

Quick Decision

Verdict

o3 Mini has the lower input price; Grok 4.20 has the lower output price; Grok 4.20 offers the larger context window. For the 1M input plus 500K output sample, Grok 4.20 is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $2.5 for Grok 4.20 and $3.3 for o3 Mini.

Best Fit

Choose Grok 4.20 when you care most about lower output-token price, and larger context window.

Choose o3 Mini when you care most about lower input-token price.

Decision Notes
  • On the standard 1M input plus 500K output workload, Grok 4.20 is estimated at $2.5 vs $3.3 for o3 Mini, saving $0.8 (24.2% lower).
  • Grok 4.20 is $0.8 cheaper on the standard workload (24.2% lower).
  • o3 Mini is $0.15 cheaper per 1M input tokens (12% lower; 1.14x difference).
  • Grok 4.20 is $1.9 cheaper per 1M output tokens (43.2% lower; 1.76x difference).
  • Grok 4.20 has 1.8M more context (10x larger).
Head-to-Head Specs
FeatureGrok 4.20
(xAI)		o3 Mini
(OpenAI)
Input Price
prompt tokens per 1M		$1.25$1.1
Completion Price
per 1M tokens		$2.5$4.4
Sample Workload Cost
1M input + 500K output		$2.5$3.3
Context Window2M200K
Release Date
Popularity#92#120

Use-Case Decision Matrix

Use caseBetter pickWhy
Budget-constrained productionGrok 4.20On the standard 1M input plus 500K output workload, Grok 4.20 is estimated at $2.5 vs $3.3 for o3 Mini, saving $0.8 (24.2% lower).
High-volume input processingo3 MiniLower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbotsGrok 4.20Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document workGrok 4.20A larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps
  • Grok Build 0.1 can replace Grok 4.20 when lower sample workload cost matters most: $2.
  • gpt-oss-120b (free) can replace o3 Mini when lower sample workload cost matters most: $0.
  • gpt-oss-20b (free) can replace o3 Mini when lower sample workload cost matters most: $0.
  • gpt-oss-20b can replace o3 Mini when lower sample workload cost matters most: $0.1.
Larger context near this budget
  • Llama 4 Scout offers 10M context with $0.23 sample workload cost.

Cheaper alternatives

Review low-cost models sorted by a standard 1M input plus 500K output workload.

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Larger context alternatives

Find models with larger context windows for RAG, long documents, and codebase review.

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Provider catalogs

Compare models within provider hubs before choosing a final API vendor.

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xAI catalog

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OpenAI catalog

Check other OpenAI models with comparable pricing, context, or release timing.

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