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Model comparison

Claude Mythos 5 vs Gemini 3.5 Flash-Lite

Data verified

Head-to-head evidence from 4 shared benchmark results across 2 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

83.93/100
No comparison
N/A
2 category wins0 category wins

Public leaderboard positions: Claude Mythos 5 #1 (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 Mythos 5 and Gemini 3.5 Flash-Lite share 4 comparable benchmark results. 2 of 8 categories are comparable. 11 results are unique to Claude Mythos 5; 17 to Gemini 3.5 Flash-Lite.

Updated July 21, 2026
Shared results
4
Claude Mythos 5 only
11
Gemini 3.5 Flash-Lite only
17
Comparable categories
2 / 8

Treat this as a split decision. Claude Mythos 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 4 shared benchmark results across 2 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 Mythos 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 Mythos 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 Mythos 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 Mythos 5 and Gemini 3.5 Flash-Lite
CategoryClaude Mythos 5ΔGemini 3.5 Flash-Lite
CodingClaude Mythos 589.7Margin← 35.5Gemini 3.5 Flash-Lite54.2
AgenticClaude Mythos 587.0Margin← 23.6Gemini 3.5 Flash-Lite63.4
ReasoningClaude Mythos 5Not measuredMarginNo overlapGemini 3.5 Flash-Lite72.2
KnowledgeClaude Mythos 568.5MarginNo overlapGemini 3.5 Flash-LiteNot measured
MathClaude Mythos 597.6MarginNo overlapGemini 3.5 Flash-LiteNot measured
MultimodalClaude Mythos 593.5MarginNo overlapGemini 3.5 Flash-LiteNot measured

Decisive benchmark drivers

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

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

  1. Terminal-Bench 2.0

    Agentic
    Source ↗
    A 88%B 54%
    Winner: Claude Mythos 5Δ 34
    Terminal-Bench 2.0: Claude Mythos 5 scored 88%; Gemini 3.5 Flash-Lite scored 54%. Claude Mythos 5 wins this benchmark.

  2. SWE-bench Pro

    Coding
    Source ↗
    A 80.3%B 54.2%
    Winner: Claude Mythos 5Δ 26.1
    SWE-bench Pro: Claude Mythos 5 scored 80.3%; Gemini 3.5 Flash-Lite scored 54.2%. Claude Mythos 5 wins this benchmark.

  3. OSWorld-Verified

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

Operational comparison

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

MetricClaude Mythos 5Gemini 3.5 Flash-LiteComparison
Input / output priceUSD per 1M tokensClaude Mythos 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 Mythos 5Not availableGemini 3.5 Flash-LiteNot availableA complete speed comparison is not available.
First-answer latencyseconds to first tokenClaude Mythos 5Not availableGemini 3.5 Flash-LiteNot availableA complete latency comparison is not available.
Context windowmaximum listed tokensClaude Mythos 51M+Gemini 3.5 Flash-Lite1MClaude Mythos 5 lists the larger context window.

Benchmark Deep Dive

AgenticClaude Mythos 5 wins
BenchmarkClaude Mythos 5Gemini 3.5 Flash-LiteResult
Terminal-Bench 2.0Source 88%54%Claude Mythos 5 leads
OSWorld-VerifiedSource 85%74%Claude Mythos 5 leads
BrowseCompSource 88%—Not comparable
ExploitGymSource 17.5%—Not comparable
GDPval-AASource —1140Not comparable
AA Agentic IndexSource —26.8%Not comparable
GDPval-AASource —32.0%Not comparable
AA BriefcaseSource —634Not comparable
AA Tau3 BankingSource —16.5%Not comparable
CodingClaude Mythos 5 wins
BenchmarkClaude Mythos 5Gemini 3.5 Flash-LiteResult
SWE-bench VerifiedSource 95.5%—Not comparable
SWE-bench ProSource 80.3%54.2%Claude Mythos 5 leads
Terminal-Bench 2.0Source 88.0%54.0%Claude Mythos 5 leads
AA Coding IndexSource —49.3%Not comparable
AA-SciCodeSource —40.9%Not comparable
Reasoning
BenchmarkClaude Mythos 5Gemini 3.5 Flash-LiteResult
MRCRv2Source —72.2%Not comparable
AA-LCRSource —62.0%Not comparable
CritPtSource —0.0%Not comparable
Knowledge
BenchmarkClaude Mythos 5Gemini 3.5 Flash-LiteResult
GPQASource 94.1%—Not comparable
HLESource 64.5%—Not comparable
HLE w/o toolsSource 59%—Not comparable
Artificial Analysis Intelligence IndexSource —36.5%Not comparable
AA-GPQA DiamondSource —83.8%Not comparable
AA-HLESource —17.5%Not comparable
AA-Omniscience IndexSource —6.9%Not comparable
AA-Omniscience AccuracySource —30.3%Not comparable
AA-Omniscience Hallucination RateSource —33.5%Not comparable
Math
BenchmarkClaude Mythos 5Gemini 3.5 Flash-LiteResult
USAMO 2026Source 97.6%—Not comparable
Multilingual
BenchmarkClaude Mythos 5Gemini 3.5 Flash-LiteResult
SWE MultilingualSource 92.2%—Not comparable
Multimodal
BenchmarkClaude Mythos 5Gemini 3.5 Flash-LiteResult
SWE-bench MultimodalSource 54.9%—Not comparable
CharXivSource 93.5%—Not comparable
CharXiv w/o toolsSource 88.9%—Not comparable
AA-MMMU-ProSource —79.0%Not comparable
Frequently Asked Questions (3)

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

Claude Mythos 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 Mythos 5 or Gemini 3.5 Flash-Lite?

Claude Mythos 5 has the edge for coding in this comparison, averaging 89.7 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 Mythos 5 or Gemini 3.5 Flash-Lite?

Claude Mythos 5 has the edge for agentic tasks in this comparison, averaging 87 versus 63.4. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.

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