API cost decision in 10 seconds

Claude Fable 5.1 (batch) vs Gemini 3.5 Flash Lite

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

On the standard 1M input plus 500K output workload, Gemini 3.5 Flash Lite is estimated at $1.55 vs $17.5 for Claude Fable 5.1 (batch), saving $15.95 (91.1% lower).

Cost-first pickGemini 3.5 Flash Lite
Context-first pickGemini 3.5 Flash Lite
Sample savings$15.9591.1%
10x traffic gap$159.5

Gemini 3.5 Flash Lite is cheaper on the standard workload and also has the larger context window. At 10x that traffic, the same price gap is about $159.5. 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 Lite stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shapeToken mixBetter pickClaude Fable 5.1 (batch)Gemini 3.5 Flash Lite
Input-heavy / RAG 5M input + 500K output Gemini 3.5 Flash Lite $37.5 $2.75
Balanced workload 1M input + 1M output Gemini 3.5 Flash Lite $30 $2.8
Output-heavy chatbot 1M input + 5M output Gemini 3.5 Flash Lite $130 $12.8
Cheaper inputGemini 3.5 Flash Lite$5 vs $0.3 / 1M
Cheaper outputGemini 3.5 Flash Lite$25 vs $2.5 / 1M
Larger contextGemini 3.5 Flash Lite1M vs 1.05M
Sample workloadGemini 3.5 Flash Lite$17.5 vs $1.55

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.
Claude Fable 5.1 (batch)Calculating…Estimated API cost
Gemini 3.5 Flash LiteCalculating…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 Lite has the lower input price, Gemini 3.5 Flash Lite has the lower output price, and Gemini 3.5 Flash Lite offers the larger context window.

For a 1M input token plus 500K output token workload, the estimated API cost is $17.5 for Claude Fable 5.1 (batch) and $1.55 for Gemini 3.5 Flash Lite.

Best Fit

Choose Claude Fable 5.1 (batch) when its provider, model quality, latency, or availability is more important than the numeric price/context winner.

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

Head-to-Head Specs
FeatureClaude Fable 5.1 (batch)
(Anthropic)		Gemini 3.5 Flash Lite
(Google)
Input Price
prompt tokens per 1M		$5$0.3
Completion Price
per 1M tokens		$25$2.5
Sample Workload Cost
1M input + 500K output		$17.5$1.55
Context Window1M1.05M
Release Date2026-09-012026-07-21
Claude Fable 5.1 (batch)

Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...

Gemini 3.5 Flash Lite

Gemini 3.5 Flash Lite is a high-efficiency model from Google with upgraded agentic capabilities. It is suited for subagents that execute focused tasks within complex, multi-agent workflows.

Use-Case Decision Matrix

Use caseBetter pickWhy
Budget-constrained productionGemini 3.5 Flash LiteOn the standard 1M input plus 500K output workload, Gemini 3.5 Flash Lite is estimated at $1.55 vs $17.5 for Claude Fable 5.1 (batch), saving $15.95 (91.1% lower).
High-volume input processingGemini 3.5 Flash LiteLower prompt-token price matters most when prompts or retrieved passages dominate the bill.
Long responses and chatbotsGemini 3.5 Flash LiteLower output-token price matters most when assistants generate many completion tokens.
RAG or long-document workGemini 3.5 Flash LiteA larger context window leaves more room for retrieved passages and source files.