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Model comparison

Claude Mythos 5 vs Step 3.7 Flash

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
Margin
33.1pts
← winning
50.87/100
2 category wins0 category wins

Public leaderboard positions: Claude Mythos 5 #1 (Supported); Step 3.7 Flash #110 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Claude Mythos 5 and Step 3.7 Flash share 4 comparable benchmark results. 2 of 8 categories are comparable. 11 results are unique to Claude Mythos 5; 25 to Step 3.7 Flash.

Updated July 23, 2026
Shared results
4
Claude Mythos 5 only
11
Step 3.7 Flash only
25
Comparable categories
2 / 8

Pick Claude Mythos 5 if you want the stronger benchmark profile. Step 3.7 Flash only becomes the better choice 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 is clearly ahead on the BenchAlign aggregate, 83.93 to 50.87. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

Claude Mythos 5's sharpest advantage is in coding, where it averages 89.7 against 56.3. The single biggest benchmark swing on the page is Terminal-Bench 2.0, 88% to 59.5%.

Claude Mythos 5 is also the more expensive model on tokens at $10.00 input / $50.00 output per 1M tokens, versus $0.20 input / $1.15 output per 1M tokens for Step 3.7 Flash. That is roughly 43.5x on output cost alone. Claude Mythos 5 gives you the larger context window at 1M+, compared with 256K for Step 3.7 Flash.

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 Step 3.7 Flash
CategoryClaude Mythos 5ΔStep 3.7 Flash
CodingClaude Mythos 589.7Margin← 33.4Step 3.7 Flash56.3
AgenticClaude Mythos 587.0Margin← 20.6Step 3.7 Flash66.4
KnowledgeClaude Mythos 568.5MarginNo overlapStep 3.7 FlashNot measured
MathClaude Mythos 597.6MarginNo overlapStep 3.7 FlashNot measured
MultimodalClaude Mythos 593.5MarginNo overlapStep 3.7 FlashNot measured

Decisive benchmark drivers

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

More
A · Claude Mythos 5B · Step 3.7 Flash

  1. Terminal-Bench 2.0

    Agentic
    Source ↗
    A 88%B 59.5%
    Winner: Claude Mythos 5Δ 28.5
    Terminal-Bench 2.0: Claude Mythos 5 scored 88%; Step 3.7 Flash scored 59.5%. Claude Mythos 5 wins this benchmark.

  2. SWE-bench Pro

    Coding
    Source ↗
    A 80.3%B 56.3%
    Winner: Claude Mythos 5Δ 24
    SWE-bench Pro: Claude Mythos 5 scored 80.3%; Step 3.7 Flash scored 56.3%. Claude Mythos 5 wins this benchmark.

  3. BrowseComp

    Agentic
    Source ↗
    A 88%B 75.8%
    Winner: Claude Mythos 5Δ 12.2
    BrowseComp: Claude Mythos 5 scored 88%; Step 3.7 Flash scored 75.8%. 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 5Step 3.7 FlashComparison
Input / output priceUSD per 1M tokensClaude Mythos 5$10 input / $50 outputStep 3.7 Flash$0.2 input / $1.15 outputStep 3.7 Flash has the lower combined listed price.
Generation speedtokens per secondClaude Mythos 5Not availableStep 3.7 FlashNot availableA complete speed comparison is not available.
First-answer latencyseconds to first tokenClaude Mythos 5Not availableStep 3.7 FlashNot availableA complete latency comparison is not available.
Context windowmaximum listed tokensClaude Mythos 51M+Step 3.7 Flash256KClaude Mythos 5 lists the larger context window.

Benchmark Deep Dive

AgenticClaude Mythos 5 wins
BenchmarkClaude Mythos 5Step 3.7 FlashResult
Terminal-Bench 2.0Source 88%59.5%Claude Mythos 5 leads
OSWorld-VerifiedSource 85%—Not comparable
BrowseCompSource 88%75.8%Claude Mythos 5 leads
ExploitGymSource 17.5%—Not comparable
DeepSearchQASource —92.8%Not comparable
GDPval-AASource —25.9%Not comparable
ToolathlonSource —49.5%Not comparable
Claw-EvalSource —67.1%Not comparable
HLE w/ toolsSource —47.2%Not comparable
Gert LabsSource —51.57%Not comparable
AA Agentic IndexSource —21.5%Not comparable
τ²-bench resultsSource —98.5%Not comparable
GDPval-AASource —1017Not comparable
APEX-Agents-AASource —14.8%Not comparable
CodingClaude Mythos 5 wins
BenchmarkClaude Mythos 5Step 3.7 FlashResult
SWE-bench VerifiedSource 95.5%—Not comparable
SWE-bench ProSource 80.3%56.3%Claude Mythos 5 leads
Terminal-Bench 2.0Source 88.0%59.5%Claude Mythos 5 leads
AA Coding IndexSource —39.6%Not comparable
AA-SciCodeSource —40.0%Not comparable
Reasoning
BenchmarkClaude Mythos 5Step 3.7 FlashResult
AA-LCRSource —63.7%Not comparable
CritPtSource —2.3%Not comparable
Knowledge
BenchmarkClaude Mythos 5Step 3.7 FlashResult
GPQASource 94.1%—Not comparable
HLESource 64.5%—Not comparable
HLE w/o toolsSource 59%—Not comparable
Artificial Analysis Intelligence IndexSource —30.3%Not comparable
AA-GPQA DiamondSource —80.9%Not comparable
AA-HLESource —19.9%Not comparable
AA-Omniscience IndexSource —-37.5%Not comparable
AA-Omniscience AccuracySource —25.4%Not comparable
AA-Omniscience Hallucination RateSource —84.4%Not comparable
Math
BenchmarkClaude Mythos 5Step 3.7 FlashResult
USAMO 2026Source 97.6%—Not comparable
Multilingual
BenchmarkClaude Mythos 5Step 3.7 FlashResult
SWE MultilingualSource 92.2%—Not comparable
Multimodal
BenchmarkClaude Mythos 5Step 3.7 FlashResult
SWE-bench MultimodalSource 54.9%—Not comparable
CharXivSource 93.5%—Not comparable
CharXiv w/o toolsSource 88.9%—Not comparable
SimpleVQASource —79.2%Not comparable
V*Source —95.3%Not comparable
AA-MMMU-ProSource —75.3%Not comparable
Design Arena WebsiteSource —1211Not comparable
Inst. Following
BenchmarkClaude Mythos 5Step 3.7 FlashResult
AA-IFBenchSource —67.3%Not comparable
Frequently Asked Questions (3)

Which is better, Claude Mythos 5 or Step 3.7 Flash?

Claude Mythos 5 is ahead on BenchLM's BenchAlign leaderboard, 83.93 to 50.87. The biggest single separator in this matchup is Terminal-Bench 2.0, where the scores are 88% and 59.5%.

Which is better for coding, Claude Mythos 5 or Step 3.7 Flash?

Claude Mythos 5 has the edge for coding in this comparison, averaging 89.7 versus 56.3. 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 Step 3.7 Flash?

Claude Mythos 5 has the edge for agentic tasks in this comparison, averaging 87 versus 66.4. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.

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