API cost decision in 10 seconds

Grok 4.3 vs 🔥GPT-5.4

Pick Grok 4.3 for lower cost; pick GPT-5.4 only if the larger context window matters more.

Pricing data updated:  Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Grok 4.3 for lower cost; pick GPT-5.4 only if the larger context window matters more.

On the standard 1M input plus 500K output workload, Grok 4.3 is estimated at $2.5 vs $10 for GPT-5.4, saving $7.5 (75% lower).

Cost-first pickGrok 4.3
Context-first pickGPT-5.4
Sample savings$7.575%
10x traffic gap$75

GPT-5.4 has more context, but Grok 4.3 saves $7.5 on the standard workload. At 10x that traffic, the same price gap is about $75. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

Grok 4.3 stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shapeToken mixBetter pickGrok 4.3GPT-5.4
Input-heavy / RAG 5M input + 500K output Grok 4.3 $7.5 $20
Balanced workload 1M input + 1M output Grok 4.3 $3.75 $17.5
Output-heavy chatbot 1M input + 5M output Grok 4.3 $13.75 $77.5
Cheaper inputGrok 4.3$1.25 vs $2.5 / 1M
Cheaper outputGrok 4.3$2.5 vs $15 / 1M
Larger contextGPT-5.41M vs 1.05M
Sample workloadGrok 4.3$2.5 vs $10

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.
Grok 4.3Calculating…Estimated API cost
GPT-5.4Calculating…Estimated API cost
Cheaper for this workloadCalculating…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 4.3 has the lower input price, Grok 4.3 has the lower output price, and GPT-5.4 offers the larger context window.

For a 1M input token plus 500K output token workload, the estimated API cost is $2.5 for Grok 4.3 and $10 for GPT-5.4.

Best Fit

Choose Grok 4.3 when you care most about lower input-token price, and lower output-token price.

Choose GPT-5.4 when you care most about larger context window.

Head-to-Head Specs
FeatureGrok 4.3
(xAI)		🔥GPT-5.4
(OpenAI)
Input Price
prompt tokens per 1M		$1.25$2.5
Completion Price
per 1M tokens		$2.5$15
Sample Workload Cost
1M input + 500K output		$2.5$10
Context Window1M1.05M
Release Date2026-04-302026-03-05
Popularity#19
Grok 4.3

Grok 4.3 is a reasoning model from xAI. It accepts text and image inputs with text output, and is suited for agentic workflows, instruction-following tasks, and applications requiring high factual...

GPT-5.4

GPT-5.4 is OpenAI’s latest frontier model, unifying the Codex and GPT lines into a single system. It features a 1M+ token context window (922K input, 128K output) with support for...

Use-Case Decision Matrix

Use caseBetter pickWhy
Budget-constrained productionGrok 4.3On the standard 1M input plus 500K output workload, Grok 4.3 is estimated at $2.5 vs $10 for GPT-5.4, saving $7.5 (75% lower).
High-volume input processingGrok 4.3Lower prompt-token price matters most when prompts or retrieved passages dominate the bill.
Long responses and chatbotsGrok 4.3Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document workGPT-5.4A larger context window leaves more room for retrieved passages and source files.