API cost decision in 10 seconds

Grok 4.20 vs GPT Audio

Pick Grok 4.20 when budget and context both matter.

Pricing data updated:  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 $7.5 for GPT Audio, saving $5 (66.7% lower).

Cost-first pickGrok 4.20
Context-first pickGrok 4.20
Sample savings$566.7%
10x traffic gap$50

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 $50. 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 4.20GPT Audio
Input-heavy / RAG5M input + 500K outputGrok 4.20$7.5$17.5
Balanced workload1M input + 1M outputGrok 4.20$3.75$12.5
Output-heavy chatbot1M input + 5M outputGrok 4.20$13.75$52.5
Cheaper input Grok 4.20 $1.25 vs $2.5 / 1M

Grok 4.20 is $1.25 cheaper per 1M input tokens (50% lower; 2x difference).

Cheaper output Grok 4.20 $2.5 vs $10 / 1M

Grok 4.20 is $7.5 cheaper per 1M output tokens (75% lower; 4x difference).

Larger context Grok 4.20 2M vs 128K

Grok 4.20 has 1.87M more context (15.6x larger).

Sample workload Grok 4.20 $2.5 vs $7.5

Grok 4.20 is $5 cheaper on the standard workload (66.7% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.
Grok 4.20 Calculating… Estimated API cost
GPT Audio 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

Grok 4.20 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 $7.5 for GPT Audio.

Best Fit

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

Choose GPT Audio when its provider, model quality, latency, or availability is more important than the numeric price/context winner.

Decision Notes
  • On the standard 1M input plus 500K output workload, Grok 4.20 is estimated at $2.5 vs $7.5 for GPT Audio, saving $5 (66.7% lower).
  • Grok 4.20 is $5 cheaper on the standard workload (66.7% lower).
  • Grok 4.20 is $1.25 cheaper per 1M input tokens (50% lower; 2x difference).
  • Grok 4.20 is $7.5 cheaper per 1M output tokens (75% lower; 4x difference).
  • Grok 4.20 has 1.87M more context (15.6x larger).
Head-to-Head Specs
FeatureGrok 4.20
(xAI)		GPT Audio
(OpenAI)
Input Price
prompt tokens per 1M		$1.25$2.5
Completion Price
per 1M tokens		$2.5$10
Sample Workload Cost
1M input + 500K output		$2.5$7.5
Context Window2M128K
Release Date

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 $7.5 for GPT Audio, saving $5 (66.7% lower).
High-volume input processingGrok 4.20Lower 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 GPT Audio when lower sample workload cost matters most: $0.
  • gpt-oss-20b (free) can replace GPT Audio when lower sample workload cost matters most: $0.
  • gpt-oss-20b can replace GPT Audio 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.
Popular competitors
  • No popular competitor is currently available.

Cheaper alternatives

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Larger context alternatives

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Provider catalogs

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xAI catalog

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OpenAI catalog

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Open OpenAI models
Grok 4.20

Grok 4.20 is a reasoning model from xAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering...

GPT Audio

The gpt-audio model is OpenAI's first generally available audio model. The new snapshot features an upgraded decoder for more natural sounding voices and maintains better voice consistency. Audio is priced...