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Model comparison

Claude Mythos 5 vs Muse Spark 1.1

Data verified

Head-to-head evidence from 8 shared benchmark results across 4 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

83.93/100
Margin
6.5pts
← winning
77.44/100
4 category wins0 category wins

Public leaderboard positions: Claude Mythos 5 #1 (Supported); Muse Spark 1.1 #6 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Claude Mythos 5 and Muse Spark 1.1 share 8 comparable benchmark results. 4 of 8 categories are comparable. 7 results are unique to Claude Mythos 5; 31 to Muse Spark 1.1.

Updated July 23, 2026
Shared results
8
Claude Mythos 5 only
7
Muse Spark 1.1 only
31
Comparable categories
4 / 8

Pick Claude Mythos 5 if you want the stronger benchmark profile. Muse Spark 1.1 only becomes the better choice if its workflow or ecosystem matters more than the raw scoreboard.

Confidence note. This is a partial-evidence comparison with 8 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 77.44. 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 61.5. The single biggest benchmark swing on the page is SWE-bench Pro, 80.3% to 61.5%.

Claude Mythos 5 gives you the larger context window at 1M+, compared with 1M for Muse Spark 1.1.

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 Muse Spark 1.1
CategoryClaude Mythos 5ΔMuse Spark 1.1
CodingClaude Mythos 589.7Margin← 28.2Muse Spark 1.161.5
AgenticClaude Mythos 587.0Margin← 6.6Muse Spark 1.180.4
KnowledgeClaude Mythos 568.5Margin← 6.4Muse Spark 1.162.1
MultimodalClaude Mythos 593.5Margin← 5.1Muse Spark 1.188.4
MathClaude Mythos 597.6MarginNo overlapMuse Spark 1.1Not measured

Decisive benchmark drivers

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

More
A · Claude Mythos 5B · Muse Spark 1.1

  1. SWE-bench Pro

    Coding
    Source ↗
    A 80.3%B 61.5%
    Winner: Claude Mythos 5Δ 18.8
    SWE-bench Pro: Claude Mythos 5 scored 80.3%; Muse Spark 1.1 scored 61.5%. Claude Mythos 5 wins this benchmark.

  2. Terminal-Bench 2.0

    Agentic
    Source ↗
    A 88%B 80%
    Winner: Claude Mythos 5Δ 8
    Terminal-Bench 2.0: Claude Mythos 5 scored 88%; Muse Spark 1.1 scored 80%. Claude Mythos 5 wins this benchmark.

  3. CharXiv

    Multimodal
    Source ↗
    A 93.5%B 88.4%
    Winner: Claude Mythos 5Δ 5.1
    CharXiv: Claude Mythos 5 scored 93.5%; Muse Spark 1.1 scored 88.4%. Claude Mythos 5 wins this benchmark.

  4. OSWorld-Verified

    Agentic
    Source ↗
    A 85%B 80.8%
    Winner: Claude Mythos 5Δ 4.2
    OSWorld-Verified: Claude Mythos 5 scored 85%; Muse Spark 1.1 scored 80.8%. Claude Mythos 5 wins this benchmark.

  5. HLE

    Knowledge
    Source ↗
    A 64.5%B 62.1%
    Winner: Claude Mythos 5Δ 2.4
    HLE: Claude Mythos 5 scored 64.5%; Muse Spark 1.1 scored 62.1%. 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 5Muse Spark 1.1Comparison
Input / output priceUSD per 1M tokensClaude Mythos 5$10 input / $50 outputMuse Spark 1.1Not availableA complete price comparison is not available.
Generation speedtokens per secondClaude Mythos 5Not availableMuse Spark 1.1Not availableA complete speed comparison is not available.
First-answer latencyseconds to first tokenClaude Mythos 5Not availableMuse Spark 1.1Not availableA complete latency comparison is not available.
Context windowmaximum listed tokensClaude Mythos 51M+Muse Spark 1.11MClaude Mythos 5 lists the larger context window.

Benchmark Deep Dive

AgenticClaude Mythos 5 wins
BenchmarkClaude Mythos 5Muse Spark 1.1Result
Terminal-Bench 2.0Source 88%80%Claude Mythos 5 leads
OSWorld-VerifiedSource 85%80.8%Claude Mythos 5 leads
BrowseCompSource 88%—Not comparable
ExploitGymSource 17.5%0.8%Claude Mythos 5 leads
MCP AtlasSource —88.1%Not comparable
ToolathlonSource —75.6%Not comparable
DeepSearchQASource —84.9%Not comparable
CyberGymSource —59.0%Not comparable
Finance Agent v2Source —57.2%Not comparable
deepSweSource —53.3%Not comparable
OSWorld 2.0Source —14.2%Not comparable
JobBenchSource —54.7%Not comparable
CybenchSource —92.9%Not comparable
AA Agentic IndexSource —37.5%Not comparable
GDPval-AASource —43.7%Not comparable
GDPval-AASource —1374Not comparable
AA BriefcaseSource —863Not comparable
AA AutomationBenchSource —42.8%Not comparable
AA Harvey LABSource —93.1%Not comparable
AA Tau3 BankingSource —25.2%Not comparable
aaTerminalBench21Source —77.9%Not comparable
CodingClaude Mythos 5 wins
BenchmarkClaude Mythos 5Muse Spark 1.1Result
SWE-bench VerifiedSource 95.5%—Not comparable
SWE-bench ProSource 80.3%61.5%Claude Mythos 5 leads
Terminal-Bench 2.0Source 88.0%80.0%Claude Mythos 5 leads
AA Coding IndexSource —71.3%Not comparable
AA-SciCodeSource —58.2%Not comparable
Reasoning
BenchmarkClaude Mythos 5Muse Spark 1.1Result
MRCR 1MSource —54.1%Not comparable
AA-LCRSource —63.3%Not comparable
CritPtSource —15.1%Not comparable
KnowledgeClaude Mythos 5 wins
BenchmarkClaude Mythos 5Muse Spark 1.1Result
GPQASource 94.1%—Not comparable
HLESource 64.5%62.1%Claude Mythos 5 leads
HLE w/o toolsSource 59%52.2%Claude Mythos 5 leads
HealthBench ProfessionalSource —59.3%Not comparable
Artificial Analysis Intelligence IndexSource —50.6%Not comparable
AA-GPQA DiamondSource —89.8%Not comparable
AA-HLESource —45.1%Not comparable
AA-Omniscience IndexSource —18.0%Not comparable
AA-Omniscience AccuracySource —40.6%Not comparable
AA-Omniscience Hallucination RateSource —38.1%Not comparable
Math
BenchmarkClaude Mythos 5Muse Spark 1.1Result
USAMO 2026Source 97.6%—Not comparable
Multilingual
BenchmarkClaude Mythos 5Muse Spark 1.1Result
SWE MultilingualSource 92.2%—Not comparable
MultimodalClaude Mythos 5 wins
BenchmarkClaude Mythos 5Muse Spark 1.1Result
SWE-bench MultimodalSource 54.9%—Not comparable
CharXivSource 93.5%88.4%Claude Mythos 5 leads
CharXiv w/o toolsSource 88.9%—Not comparable
BabyVisionSource —76.3%Not comparable
Design Arena WebsiteSource —1299Not comparable
Frequently Asked Questions (5)

Which is better, Claude Mythos 5 or Muse Spark 1.1?

Claude Mythos 5 is ahead on BenchLM's BenchAlign leaderboard, 83.93 to 77.44. The biggest single separator in this matchup is SWE-bench Pro, where the scores are 80.3% and 61.5%.

Which is better for knowledge tasks, Claude Mythos 5 or Muse Spark 1.1?

Claude Mythos 5 has the edge for knowledge tasks in this comparison, averaging 68.5 versus 62.1. 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 Muse Spark 1.1?

Claude Mythos 5 has the edge for coding in this comparison, averaging 89.7 versus 61.5. 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 Muse Spark 1.1?

Claude Mythos 5 has the edge for agentic tasks in this comparison, averaging 87 versus 80.4. Inside this category, ExploitGym is the benchmark that creates the most daylight between them.

Which is better for multimodal and grounded tasks, Claude Mythos 5 or Muse Spark 1.1?

Claude Mythos 5 has the edge for multimodal and grounded tasks in this comparison, averaging 93.5 versus 88.4. Inside this category, CharXiv is the benchmark that creates the most daylight between them.

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