API cost decision in 10 seconds

🔥GPT-5.4 vs 🔥Gemini 3 Flash Preview

Pick Gemini 3 Flash Preview 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 Gemini 3 Flash Preview for lower cost; pick GPT-5.4 only if the larger context window matters more.

On the standard 1M input plus 500K output workload, Gemini 3 Flash Preview is estimated at $2 vs $10 for GPT-5.4, saving $8 (80% lower).

Cost-first pickGemini 3 Flash Preview
Context-first pickGPT-5.4
Sample savings$880%
10x traffic gap$80

GPT-5.4 has more context, but Gemini 3 Flash Preview saves $8 on the standard workload. At 10x that traffic, the same price gap is about $80. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

Gemini 3 Flash Preview stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shapeToken mixBetter pickGPT-5.4Gemini 3 Flash Preview
Input-heavy / RAG 5M input + 500K output Gemini 3 Flash Preview $20 $4
Balanced workload 1M input + 1M output Gemini 3 Flash Preview $17.5 $3.5
Output-heavy chatbot 1M input + 5M output Gemini 3 Flash Preview $77.5 $15.5
Cheaper inputGemini 3 Flash Preview$2.5 vs $0.5 / 1M
Cheaper outputGemini 3 Flash Preview$15 vs $3 / 1M
Larger contextGPT-5.41.05M vs 1.05M
Sample workloadGemini 3 Flash Preview$10 vs $2

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.
GPT-5.4Calculating…Estimated API cost
Gemini 3 Flash PreviewCalculating…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

Gemini 3 Flash Preview has the lower input price, Gemini 3 Flash Preview 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 $10 for GPT-5.4 and $2 for Gemini 3 Flash Preview.

Best Fit

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

Choose Gemini 3 Flash Preview when you care most about lower input-token price, and lower output-token price.

Head-to-Head Specs
Feature🔥GPT-5.4
(OpenAI)		🔥Gemini 3 Flash Preview
(Google)
Input Price
prompt tokens per 1M		$2.5$0.5
Completion Price
per 1M tokens		$15$3
Sample Workload Cost
1M input + 500K output		$10$2
Context Window1.05M1.05M
Release Date2026-03-052025-12-17
Popularity#19#7
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...

Gemini 3 Flash Preview

Gemini 3 Flash Preview is a high speed, high value thinking model designed for agentic workflows, multi turn chat, and coding assistance. It delivers near Pro level reasoning and tool...

Use-Case Decision Matrix

Use caseBetter pickWhy
Budget-constrained productionGemini 3 Flash PreviewOn the standard 1M input plus 500K output workload, Gemini 3 Flash Preview is estimated at $2 vs $10 for GPT-5.4, saving $8 (80% lower).
High-volume input processingGemini 3 Flash PreviewLower prompt-token price matters most when prompts or retrieved passages dominate the bill.
Long responses and chatbotsGemini 3 Flash PreviewLower 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.