Skip to main content
BenchLM
Advertise

Model comparison

Claude Fable 5 vs Gemini 3.5 Flash-Lite

Data verified

Head-to-head evidence from 19 shared benchmark results across 4 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

83.68/100
No comparison
N/A
2 category wins0 category wins

Public leaderboard positions: Claude Fable 5 #2 (Supported); Gemini 3.5 Flash-Lite unranked (Not scored). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Claude Fable 5 and Gemini 3.5 Flash-Lite share 19 comparable benchmark results. 2 of 8 categories are comparable. 15 results are unique to Claude Fable 5; 2 to Gemini 3.5 Flash-Lite.

Updated July 21, 2026
Shared results
19
Claude Fable 5 only
15
Gemini 3.5 Flash-Lite only
2
Comparable categories
2 / 8

Treat this as a split decision. Claude Fable 5 makes more sense if coding is the priority or you need the larger 1M+ context window; Gemini 3.5 Flash-Lite is the better fit if you want the cheaper token bill.

Confidence note. This is a partial-evidence comparison with 19 shared benchmark results across 4 evidence categories; 2 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.

Why this result

Claude Fable 5 and Gemini 3.5 Flash-Lite finish on the same BenchAlign overall score, so this is less about a single winner and more about where the edge shows up. The BenchAlign headline says tie; the benchmark table is where the real choice happens.

Claude Fable 5 is also the more expensive model on tokens at $10.00 input / $50.00 output per 1M tokens, versus $0.30 input / $2.50 output per 1M tokens for Gemini 3.5 Flash-Lite. That is roughly 20.0x on output cost alone. Claude Fable 5 gives you the larger context window at 1M+, compared with 1M for Gemini 3.5 Flash-Lite.

Category breakdown

Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.

Category scores and score margins for Claude Fable 5 and Gemini 3.5 Flash-Lite
CategoryClaude Fable 5ΔGemini 3.5 Flash-Lite
CodingClaude Fable 589.2Margin← 35.0Gemini 3.5 Flash-Lite54.2
AgenticClaude Fable 584.6Margin← 21.2Gemini 3.5 Flash-Lite63.4
ReasoningClaude Fable 5Not measuredMarginNo overlapGemini 3.5 Flash-Lite72.2
MultimodalClaude Fable 557.9MarginNo overlapGemini 3.5 Flash-LiteNot measured

Decisive benchmark drivers

The largest measured benchmark gaps in this matchup, with exact reported values.

More
A · Claude Fable 5B · Gemini 3.5 Flash-Lite

  1. Terminal-Bench 2.0

    Agentic
    Source ↗
    A 84.3%B 54%
    Winner: Claude Fable 5Δ 30.3
    Terminal-Bench 2.0: Claude Fable 5 scored 84.3%; Gemini 3.5 Flash-Lite scored 54%. Claude Fable 5 wins this benchmark.

  2. SWE-bench Pro

    Coding
    Source ↗
    A 80%B 54.2%
    Winner: Claude Fable 5Δ 25.8
    SWE-bench Pro: Claude Fable 5 scored 80%; Gemini 3.5 Flash-Lite scored 54.2%. Claude Fable 5 wins this benchmark.

  3. OSWorld-Verified

    Agentic
    Source ↗
    A 85%B 74%
    Winner: Claude Fable 5Δ 11
    OSWorld-Verified: Claude Fable 5 scored 85%; Gemini 3.5 Flash-Lite scored 74%. Claude Fable 5 wins this benchmark.

Operational comparison

Runtime and commercial metrics are compared only when both models have a complete sourced value.

MetricClaude Fable 5Gemini 3.5 Flash-LiteComparison
Input / output priceUSD per 1M tokensClaude Fable 5$10 input / $50 outputGemini 3.5 Flash-Lite$0.3 input / $2.5 outputGemini 3.5 Flash-Lite has the lower combined listed price.
Generation speedtokens per secondClaude Fable 5Not availableGemini 3.5 Flash-LiteNot availableA complete speed comparison is not available.
First-answer latencyseconds to first tokenClaude Fable 5Not availableGemini 3.5 Flash-LiteNot availableA complete latency comparison is not available.
Context windowmaximum listed tokensClaude Fable 51M+Gemini 3.5 Flash-Lite1MClaude Fable 5 lists the larger context window.

Benchmark Deep Dive

AgenticClaude Fable 5 wins
BenchmarkClaude Fable 5Gemini 3.5 Flash-LiteResult
Terminal-Bench 2.0Source 84.3%54%Claude Fable 5 leads
OSWorld-VerifiedSource 85%74%Claude Fable 5 leads
GDPval-AASource 17481140Claude Fable 5 leads
AA Agentic IndexSource 52.8%26.8%Claude Fable 5 leads
τ²-bench resultsSource 98.5%—Not comparable
GDPval-AASource 62.4%32.0%Claude Fable 5 leads
AA BriefcaseSource 1574634Claude Fable 5 leads
AA AutomationBenchSource 48.6%—Not comparable
AA EnterpriseOps-GymSource 51.1%—Not comparable
AA Harvey LABSource 93.6%—Not comparable
AA Tau3 BankingSource 26.8%16.5%Claude Fable 5 leads
terminalBenchHardSource 62.9%—Not comparable
aaTerminalBench21Source 84.6%—Not comparable
CodingClaude Fable 5 wins
BenchmarkClaude Fable 5Gemini 3.5 Flash-LiteResult
SWE-bench VerifiedSource 95%—Not comparable
SWE-bench ProSource 80%54.2%Claude Fable 5 leads
FrontierCode 1.1 MainSource 53.5%—Not comparable
Terminal-Bench 2.0Source 84.3%54.0%Claude Fable 5 leads
cursorBench31Source 70.6%—Not comparable
cursorBench32Source 70.5%—Not comparable
VulcanBench v3Source 87.0%—Not comparable
AA Coding IndexSource 76.5%49.3%Claude Fable 5 leads
AA-SciCodeSource 60.2%40.9%Claude Fable 5 leads
Reasoning
BenchmarkClaude Fable 5Gemini 3.5 Flash-LiteResult
AA-LCRSource 70.0%62.0%Claude Fable 5 leads
CritPtSource 28.6%0.0%Claude Fable 5 leads
MRCRv2Source —72.2%Not comparable
Knowledge
BenchmarkClaude Fable 5Gemini 3.5 Flash-LiteResult
Artificial Analysis Intelligence IndexSource 59.9%36.5%Claude Fable 5 leads
AA-GPQA DiamondSource 92.6%83.8%Claude Fable 5 leads
AA-HLESource 53.3%17.5%Claude Fable 5 leads
AA-Omniscience IndexSource 40.2%6.9%Claude Fable 5 leads
AA-Omniscience AccuracySource 61.4%30.3%Claude Fable 5 leads
AA-Omniscience Hallucination RateSource 54.9%33.5%Gemini 3.5 Flash-Lite leads
Multimodal
BenchmarkClaude Fable 5Gemini 3.5 Flash-LiteResult
Blueprint-Bench 2Source 38.6%—Not comparable
OfficeQA ProSource 57.9%—Not comparable
Design Arena WebsiteSource 1332—Not comparable
AA-MMMU-ProSource —79.0%Not comparable
Inst. Following
BenchmarkClaude Fable 5Gemini 3.5 Flash-LiteResult
AA-IFBenchSource 63.5%—Not comparable
Frequently Asked Questions (3)

Which is better, Claude Fable 5 or Gemini 3.5 Flash-Lite?

Claude Fable 5 and Gemini 3.5 Flash-Lite are tied on the BenchAlign overall score, so the right pick depends on which category matters most for your use case.

Which is better for coding, Claude Fable 5 or Gemini 3.5 Flash-Lite?

Claude Fable 5 has the edge for coding in this comparison, averaging 89.2 versus 54.2. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.

Which is better for agentic tasks, Claude Fable 5 or Gemini 3.5 Flash-Lite?

Claude Fable 5 has the edge for agentic tasks in this comparison, averaging 84.6 versus 63.4. Inside this category, AA Briefcase is the benchmark that creates the most daylight between them.

Related Comparisons

Explore More

Anthropic Compare Pricing Methodology Find Your Best LLM Overall Rankings
Last updated: July 21, 2026

Choose a model with this week’s evidence

Join 2,000+ readers for ranking moves, pricing changes, and the claims that still need proof.

One email each week. Unsubscribe anytime.