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Model comparison

Claude Mythos 5 vs Claude Sonnet 5

Data verified

Head-to-head evidence from 10 shared benchmark results across 4 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

83.93/100
Margin
18.6pts
← winning
65.32/100
4 category wins0 category wins

Public leaderboard positions: Claude Mythos 5 #1 (Supported); Claude Sonnet 5 #29 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Claude Mythos 5 and Claude Sonnet 5 share 10 comparable benchmark results. 4 of 8 categories are comparable. 5 results are unique to Claude Mythos 5; 26 to Claude Sonnet 5.

Updated July 23, 2026
Shared results
10
Claude Mythos 5 only
5
Claude Sonnet 5 only
26
Comparable categories
4 / 8

Pick Claude Mythos 5 if you want the stronger benchmark profile. Claude Sonnet 5 only becomes the better choice if you want the cheaper token bill.

Confidence note. This is a partial-evidence comparison with 10 shared benchmark results across 4 evidence categories; 4 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 65.32. 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 76.7. The single biggest benchmark swing on the page is SWE-bench Pro, 80.3% to 63.2%.

Claude Mythos 5 is also the more expensive model on tokens at $10.00 input / $50.00 output per 1M tokens, versus $2.00 input / $10.00 output per 1M tokens for Claude Sonnet 5. That is roughly 5.0x on output cost alone. Claude Mythos 5 gives you the larger context window at 1M+, compared with 1M for Claude Sonnet 5.

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 Claude Sonnet 5
CategoryClaude Mythos 5ΔClaude Sonnet 5
CodingClaude Mythos 589.7Margin← 13.0Claude Sonnet 576.7
KnowledgeClaude Mythos 568.5Margin← 11.1Claude Sonnet 557.4
MultimodalClaude Mythos 593.5Margin← 5.2Claude Sonnet 588.3
AgenticClaude Mythos 587.0Margin← 5.1Claude Sonnet 581.9
MathClaude Mythos 597.6MarginNo overlapClaude Sonnet 5Not measured

Decisive benchmark drivers

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

More
A · Claude Mythos 5B · Claude Sonnet 5

  1. SWE-bench Pro

    Coding
    Source ↗
    A 80.3%B 63.2%
    Winner: Claude Mythos 5Δ 17.1
    SWE-bench Pro: Claude Mythos 5 scored 80.3%; Claude Sonnet 5 scored 63.2%. Claude Mythos 5 wins this benchmark.

  2. SWE-bench Verified

    Coding
    Source ↗
    A 95.5%B 85.2%
    Winner: Claude Mythos 5Δ 10.3
    SWE-bench Verified: Claude Mythos 5 scored 95.5%; Claude Sonnet 5 scored 85.2%. Claude Mythos 5 wins this benchmark.

  3. Terminal-Bench 2.0

    Agentic
    Source ↗
    A 88%B 80.4%
    Winner: Claude Mythos 5Δ 7.6
    Terminal-Bench 2.0: Claude Mythos 5 scored 88%; Claude Sonnet 5 scored 80.4%. Claude Mythos 5 wins this benchmark.

  4. HLE

    Knowledge
    Source ↗
    A 64.5%B 57.4%
    Winner: Claude Mythos 5Δ 7.1
    HLE: Claude Mythos 5 scored 64.5%; Claude Sonnet 5 scored 57.4%. Claude Mythos 5 wins this benchmark.

  5. CharXiv

    Multimodal
    Source ↗
    A 93.5%B 88.3%
    Winner: Claude Mythos 5Δ 5.2
    CharXiv: Claude Mythos 5 scored 93.5%; Claude Sonnet 5 scored 88.3%. 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 5Claude Sonnet 5Comparison
Input / output priceUSD per 1M tokensClaude Mythos 5$10 input / $50 outputClaude Sonnet 5$2 input / $10 outputClaude Sonnet 5 has the lower combined listed price.
Generation speedtokens per secondClaude Mythos 5Not availableClaude Sonnet 5Not availableA complete speed comparison is not available.
First-answer latencyseconds to first tokenClaude Mythos 5Not availableClaude Sonnet 5Not availableA complete latency comparison is not available.
Context windowmaximum listed tokensClaude Mythos 51M+Claude Sonnet 51MClaude Mythos 5 lists the larger context window.

Benchmark Deep Dive

AgenticClaude Mythos 5 wins
BenchmarkClaude Mythos 5Claude Sonnet 5Result
Terminal-Bench 2.0Source 88%80.4%Claude Mythos 5 leads
OSWorld-VerifiedSource 85%81.2%Claude Mythos 5 leads
BrowseCompSource 88%84.7%Claude Mythos 5 leads
ExploitGymSource 17.5%—Not comparable
HLE w/ toolsSource —57.4%Not comparable
GDPval-AASource —1607Not comparable
AA Agentic IndexSource —46.7%Not comparable
GDPval-AASource —55.4%Not comparable
AA BriefcaseSource —1388Not comparable
AA AutomationBenchSource —39.2%Not comparable
AA EnterpriseOps-GymSource —44.7%Not comparable
AA Harvey LABSource —90.1%Not comparable
AA Tau3 BankingSource —28.2%Not comparable
aaTerminalBench21Source —80.5%Not comparable
CodingClaude Mythos 5 wins
BenchmarkClaude Mythos 5Claude Sonnet 5Result
SWE-bench VerifiedSource 95.5%85.2%Claude Mythos 5 leads
SWE-bench ProSource 80.3%63.2%Claude Mythos 5 leads
Terminal-Bench 2.0Source 88.0%80.4%Claude Mythos 5 leads
SWE MultilingualSource —78.3%Not comparable
SWE MultimodalSource —28.1%Not comparable
FrontierCode 1.1 MainSource —42.7%Not comparable
cursorBench32Source —61.5%Not comparable
AA Coding IndexSource —71.5%Not comparable
AA-SciCodeSource —53.6%Not comparable
Reasoning
BenchmarkClaude Mythos 5Claude Sonnet 5Result
AA-LCRSource —70.7%Not comparable
CritPtSource —16.9%Not comparable
KnowledgeClaude Mythos 5 wins
BenchmarkClaude Mythos 5Claude Sonnet 5Result
GPQASource 94.1%—Not comparable
HLESource 64.5%57.4%Claude Mythos 5 leads
HLE w/o toolsSource 59%43.2%Claude Mythos 5 leads
Artificial Analysis Intelligence IndexSource —53.4%Not comparable
AA-GPQA DiamondSource —91.1%Not comparable
AA-HLESource —39.6%Not comparable
AA-Omniscience IndexSource —15.3%Not comparable
AA-Omniscience AccuracySource —38.3%Not comparable
AA-Omniscience Hallucination RateSource —37.3%Not comparable
Math
BenchmarkClaude Mythos 5Claude Sonnet 5Result
USAMO 2026Source 97.6%—Not comparable
Multilingual
BenchmarkClaude Mythos 5Claude Sonnet 5Result
SWE MultilingualSource 92.2%—Not comparable
MultimodalClaude Mythos 5 wins
BenchmarkClaude Mythos 5Claude Sonnet 5Result
SWE-bench MultimodalSource 54.9%—Not comparable
CharXivSource 93.5%88.3%Claude Mythos 5 leads
CharXiv w/o toolsSource 88.9%77%Claude Mythos 5 leads
AA-MMMU-ProSource —77.3%Not comparable
Design Arena WebsiteSource —1314Not comparable
Frequently Asked Questions (5)

Which is better, Claude Mythos 5 or Claude Sonnet 5?

Claude Mythos 5 is ahead on BenchLM's BenchAlign leaderboard, 83.93 to 65.32. The biggest single separator in this matchup is SWE-bench Pro, where the scores are 80.3% and 63.2%.

Which is better for knowledge tasks, Claude Mythos 5 or Claude Sonnet 5?

Claude Mythos 5 has the edge for knowledge tasks in this comparison, averaging 68.5 versus 57.4. Inside this category, HLE w/o tools is the benchmark that creates the most daylight between them.

Which is better for coding, Claude Mythos 5 or Claude Sonnet 5?

Claude Mythos 5 has the edge for coding in this comparison, averaging 89.7 versus 76.7. Inside this category, SWE-bench Pro is the benchmark that creates the most daylight between them.

Which is better for agentic tasks, Claude Mythos 5 or Claude Sonnet 5?

Claude Mythos 5 has the edge for agentic tasks in this comparison, averaging 87 versus 81.9. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.

Which is better for multimodal and grounded tasks, Claude Mythos 5 or Claude Sonnet 5?

Claude Mythos 5 has the edge for multimodal and grounded tasks in this comparison, averaging 93.5 versus 88.3. Inside this category, CharXiv w/o tools is the benchmark that creates the most daylight between them.

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