API cost decision in 10 seconds

NewGrok Build 0.1 vs GPT-5.3-Codex

Pick Grok Build 0.1 for lower cost; pick GPT-5.3-Codex only if the larger context window matters more.

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

Budget verdict

Pick Grok Build 0.1 for lower cost; pick GPT-5.3-Codex only if the larger context window matters more.

On the standard 1M input plus 500K output workload, Grok Build 0.1 is estimated at $2 vs $8.75 for GPT-5.3-Codex, saving $6.75 (77.1% lower).

Cost-first pickGrok Build 0.1
Context-first pickGPT-5.3-Codex
Sample savings$6.7577.1%
10x traffic gap$67.5

GPT-5.3-Codex has more context, but Grok Build 0.1 saves $6.75 on the standard workload. At 10x that traffic, the same price gap is about $67.5. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

Grok Build 0.1 stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shapeToken mixBetter pickGrok Build 0.1GPT-5.3-Codex
Input-heavy / RAG5M input + 500K outputGrok Build 0.1$6$15.75
Balanced workload1M input + 1M outputGrok Build 0.1$3$15.75
Output-heavy chatbot1M input + 5M outputGrok Build 0.1$11$71.75
Cheaper input Grok Build 0.1 $1 vs $1.75 / 1M

Grok Build 0.1 is $0.75 cheaper per 1M input tokens (42.9% lower; 1.75x difference).

Cheaper output Grok Build 0.1 $2 vs $14 / 1M

Grok Build 0.1 is $12 cheaper per 1M output tokens (85.7% lower; 7x difference).

Larger context GPT-5.3-Codex 256K vs 400K

GPT-5.3-Codex has 144K more context (1.56x larger).

Sample workload Grok Build 0.1 $2 vs $8.75

Grok Build 0.1 is $6.75 cheaper on the standard workload (77.1% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.
Grok Build 0.1 Calculating… Estimated API cost
GPT-5.3-Codex 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 Build 0.1 has the lower input price; Grok Build 0.1 has the lower output price; GPT-5.3-Codex offers the larger context window. For the 1M input plus 500K output sample, Grok Build 0.1 is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $2 for Grok Build 0.1 and $8.75 for GPT-5.3-Codex.

Best Fit

Choose Grok Build 0.1 when you care most about lower input-token price, and lower output-token price.

Choose GPT-5.3-Codex when you care most about larger context window.

Decision Notes
  • On the standard 1M input plus 500K output workload, Grok Build 0.1 is estimated at $2 vs $8.75 for GPT-5.3-Codex, saving $6.75 (77.1% lower).
  • Grok Build 0.1 is $6.75 cheaper on the standard workload (77.1% lower).
  • Grok Build 0.1 is $0.75 cheaper per 1M input tokens (42.9% lower; 1.75x difference).
  • Grok Build 0.1 is $12 cheaper per 1M output tokens (85.7% lower; 7x difference).
  • GPT-5.3-Codex has 144K more context (1.56x larger).
Head-to-Head Specs
FeatureNewGrok Build 0.1
(xAI)		GPT-5.3-Codex
(OpenAI)
Input Price
prompt tokens per 1M		$1$1.75
Completion Price
per 1M tokens		$2$14
Sample Workload Cost
1M input + 500K output		$2$8.75
Context Window256K400K
Release Date

Use-Case Decision Matrix

Use caseBetter pickWhy
Budget-constrained productionGrok Build 0.1On the standard 1M input plus 500K output workload, Grok Build 0.1 is estimated at $2 vs $8.75 for GPT-5.3-Codex, saving $6.75 (77.1% lower).
High-volume input processingGrok Build 0.1Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbotsGrok Build 0.1Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document workGPT-5.3-CodexA larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps
  • gpt-oss-120b (free) can replace GPT-5.3-Codex when lower sample workload cost matters most: $0.
  • gpt-oss-20b (free) can replace GPT-5.3-Codex when lower sample workload cost matters most: $0.
  • gpt-oss-20b can replace GPT-5.3-Codex when lower sample workload cost matters most: $0.1.
  • gpt-oss-120b can replace GPT-5.3-Codex when lower sample workload cost matters most: $0.13.
Larger context near this budget
  • Llama 4 Scout offers 10M context with $0.23 sample workload cost.
  • Grok 4.20 Multi-Agent offers 2M context with $5 sample workload cost.
  • Grok 4.20 offers 2M context with $2.5 sample workload cost.
  • GPT-5.4 offers 1.05M context with $10 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

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xAI catalog

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OpenAI catalog

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Grok Build 0.1

Grok Build 0.1 is xAI’s fast coding model trained specifically for agentic software engineering workflows. It supports text and image inputs with text output, and is optimized for interactive coding...

GPT-5.3-Codex

GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-art results...