API cost decision in 10 seconds

🔥Gemini 3.5 Flash vs 🔥Claude Sonnet 4.6

Pick Gemini 3.5 Flash 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 Gemini 3.5 Flash when budget and context both matter.

On the standard 1M input plus 500K output workload, Gemini 3.5 Flash is estimated at $6 vs $10.5 for Claude Sonnet 4.6, saving $4.5 (42.9% lower).

Cost-first pickGemini 3.5 Flash
Context-first pickGemini 3.5 Flash
Sample savings$4.542.9%
10x traffic gap$45

Gemini 3.5 Flash is cheaper on the standard workload and also has the larger context window. At 10x that traffic, the same price gap is about $45. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

Gemini 3.5 Flash stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shapeToken mixBetter pickGemini 3.5 FlashClaude Sonnet 4.6
Input-heavy / RAG 5M input + 500K output Gemini 3.5 Flash $12 $22.5
Balanced workload 1M input + 1M output Gemini 3.5 Flash $10.5 $18
Output-heavy chatbot 1M input + 5M output Gemini 3.5 Flash $46.5 $78
Cheaper inputGemini 3.5 Flash$1.5 vs $3 / 1M
Cheaper outputGemini 3.5 Flash$9 vs $15 / 1M
Larger contextGemini 3.5 Flash1.05M vs 1M
Sample workloadGemini 3.5 Flash$6 vs $10.5

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.
Gemini 3.5 FlashCalculating…Estimated API cost
Claude Sonnet 4.6Calculating…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 3.5 Flash has the lower input price, Gemini 3.5 Flash has the lower output price, and Gemini 3.5 Flash offers the larger context window.

For a 1M input token plus 500K output token workload, the estimated API cost is $6 for Gemini 3.5 Flash and $10.5 for Claude Sonnet 4.6.

Best Fit

Choose Gemini 3.5 Flash when you care most about lower input-token price, lower output-token price, and larger context window.

Choose Claude Sonnet 4.6 when its provider, model quality, latency, or availability is more important than the numeric price/context winner.

Head-to-Head Specs
Feature🔥Gemini 3.5 Flash
(Google)		🔥Claude Sonnet 4.6
(Anthropic)
Input Price
prompt tokens per 1M		$1.5$3
Completion Price
per 1M tokens		$9$15
Sample Workload Cost
1M input + 500K output		$6$10.5
Context Window1.05M1M
Release Date2026-05-192026-02-17
Popularity#11#4
Gemini 3.5 Flash

Gemini 3.5 Flash is Google's high-efficiency multimodal model, bringing near-Pro level coding and reasoning at Flash-tier cost and speed. It is highly optimized for coding proficiency and parallel agentic execution...

Claude Sonnet 4.6

Sonnet 4.6 is Anthropic's most capable Sonnet-class model yet, with frontier performance across coding, agents, and professional work. It excels at iterative development, complex codebase navigation, end-to-end project management with...

Use-Case Decision Matrix

Use caseBetter pickWhy
Budget-constrained productionGemini 3.5 FlashOn the standard 1M input plus 500K output workload, Gemini 3.5 Flash is estimated at $6 vs $10.5 for Claude Sonnet 4.6, saving $4.5 (42.9% lower).
High-volume input processingGemini 3.5 FlashLower prompt-token price matters most when prompts or retrieved passages dominate the bill.
Long responses and chatbotsGemini 3.5 FlashLower output-token price matters most when assistants generate many completion tokens.
RAG or long-document workGemini 3.5 FlashA larger context window leaves more room for retrieved passages and source files.