Skip to main content
BenchLM
Advertise

Model comparison

Claude Mythos 5 vs GPT-4.1 mini

Data verified

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

83.93/100
Margin
39.7pts
← winning
44.19/100
3 category wins0 category wins

Public leaderboard positions: Claude Mythos 5 #1 (Supported); GPT-4.1 mini #152 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Claude Mythos 5 and GPT-4.1 mini share 2 comparable benchmark results. 3 of 8 categories are comparable. 13 results are unique to Claude Mythos 5; 20 to GPT-4.1 mini.

Updated July 23, 2026
Shared results
2
Claude Mythos 5 only
13
GPT-4.1 mini only
20
Comparable categories
3 / 8

Pick Claude Mythos 5 if you want the stronger benchmark profile. GPT-4.1 mini only becomes the better choice if you want the cheaper token bill or you would rather avoid the extra latency and token burn of a reasoning model.

Confidence note. This is a partial-evidence comparison with 2 shared benchmark results across 2 evidence categories; 3 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 44.19. 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 mathematics, where it averages 97.6 against 4.5. The single biggest benchmark swing on the page is SWE-bench Verified, 95.5% to 23.6%.

Claude Mythos 5 is also the more expensive model on tokens at $10.00 input / $50.00 output per 1M tokens, versus $0.40 input / $1.60 output per 1M tokens for GPT-4.1 mini. That is roughly 31.3x on output cost alone. Claude Mythos 5 is the reasoning model in the pair, while GPT-4.1 mini is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. Claude Mythos 5 gives you the larger context window at 1M+, compared with 1M for GPT-4.1 mini.

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 GPT-4.1 mini
CategoryClaude Mythos 5ΔGPT-4.1 mini
MathClaude Mythos 597.6Margin← 93.1GPT-4.1 mini4.5
CodingClaude Mythos 589.7Margin← 66.1GPT-4.1 mini23.6
KnowledgeClaude Mythos 568.5Margin← 4.3GPT-4.1 mini64.2
AgenticClaude Mythos 587.0MarginNo overlapGPT-4.1 miniNot measured
MultimodalClaude Mythos 593.5MarginNo overlapGPT-4.1 miniNot measured
Inst. FollowingClaude Mythos 5Not measuredMarginNo overlapGPT-4.1 mini88.5

Decisive benchmark drivers

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

More
A · Claude Mythos 5B · GPT-4.1 mini

  1. SWE-bench Verified

    Coding
    Source ↗
    A 95.5%B 23.6%
    Winner: Claude Mythos 5Δ 71.9
    SWE-bench Verified: Claude Mythos 5 scored 95.5%; GPT-4.1 mini scored 23.6%. Claude Mythos 5 wins this benchmark.

  2. GPQA

    Knowledge
    Source ↗
    A 94.1%B 64.2%
    Winner: Claude Mythos 5Δ 29.9
    GPQA: Claude Mythos 5 scored 94.1%; GPT-4.1 mini scored 64.2%. 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 5GPT-4.1 miniComparison
Input / output priceUSD per 1M tokensClaude Mythos 5$10 input / $50 outputGPT-4.1 mini$0.4 input / $1.6 outputGPT-4.1 mini has the lower combined listed price.
Generation speedtokens per secondClaude Mythos 5Not availableGPT-4.1 mini80 tok/sA complete speed comparison is not available.
First-answer latencyseconds to first tokenClaude Mythos 5Not availableGPT-4.1 mini0.76 sA complete latency comparison is not available.
Context windowmaximum listed tokensClaude Mythos 51M+GPT-4.1 mini1MClaude Mythos 5 lists the larger context window.

Benchmark Deep Dive

Agentic
BenchmarkClaude Mythos 5GPT-4.1 miniResult
Terminal-Bench 2.0Source 88%—Not comparable
OSWorld-VerifiedSource 85%—Not comparable
BrowseCompSource 88%—Not comparable
ExploitGymSource 17.5%—Not comparable
AA Agentic IndexSource —1.7%Not comparable
τ²-bench resultsSource —52.9%Not comparable
GDPval-AASource —0.1%Not comparable
GDPval-AASource —503Not comparable
CodingClaude Mythos 5 wins
BenchmarkClaude Mythos 5GPT-4.1 miniResult
SWE-bench VerifiedSource 95.5%23.6%Claude Mythos 5 leads
SWE-bench ProSource 80.3%—Not comparable
Terminal-Bench 2.0Source 88.0%—Not comparable
AA Coding IndexSource —20.2%Not comparable
AA-SciCodeSource —40.4%Not comparable
Reasoning
BenchmarkClaude Mythos 5GPT-4.1 miniResult
AA-LCRSource —42.3%Not comparable
CritPtSource —0.0%Not comparable
KnowledgeClaude Mythos 5 wins
BenchmarkClaude Mythos 5GPT-4.1 miniResult
GPQASource 94.1%64.2%Claude Mythos 5 leads
HLESource 64.5%—Not comparable
HLE w/o toolsSource 59%—Not comparable
MMLUSource —87.5%Not comparable
Artificial Analysis Intelligence IndexSource —14.8%Not comparable
AA-GPQA DiamondSource —66.4%Not comparable
AA-HLESource —4.6%Not comparable
AA-Omniscience IndexSource —-50.1%Not comparable
AA-Omniscience AccuracySource —17.5%Not comparable
AA-Omniscience Hallucination RateSource —82.0%Not comparable
MathClaude Mythos 5 wins
BenchmarkClaude Mythos 5GPT-4.1 miniResult
USAMO 2026Source 97.6%—Not comparable
FrontierMath v2 (Tiers 1-3)Source —4.483%Not comparable
Multilingual
BenchmarkClaude Mythos 5GPT-4.1 miniResult
SWE MultilingualSource 92.2%—Not comparable
Multimodal
BenchmarkClaude Mythos 5GPT-4.1 miniResult
SWE-bench MultimodalSource 54.9%—Not comparable
CharXivSource 93.5%—Not comparable
CharXiv w/o toolsSource 88.9%—Not comparable
AA-MMMU-ProSource —58.7%Not comparable
Design Arena WebsiteSource —1027Not comparable
Inst. Following
BenchmarkClaude Mythos 5GPT-4.1 miniResult
IFEvalSource —88.5%Not comparable
AA-IFBenchSource —38.3%Not comparable
Frequently Asked Questions (4)

Which is better, Claude Mythos 5 or GPT-4.1 mini?

Claude Mythos 5 is ahead on BenchLM's BenchAlign leaderboard, 83.93 to 44.19. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 95.5% and 23.6%.

Which is better for knowledge tasks, Claude Mythos 5 or GPT-4.1 mini?

Claude Mythos 5 has the edge for knowledge tasks in this comparison, averaging 68.5 versus 64.2. Inside this category, GPQA is the benchmark that creates the most daylight between them.

Which is better for coding, Claude Mythos 5 or GPT-4.1 mini?

Claude Mythos 5 has the edge for coding in this comparison, averaging 89.7 versus 23.6. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.

Which is better for math, Claude Mythos 5 or GPT-4.1 mini?

Claude Mythos 5 has the edge for math in this comparison, averaging 97.6 versus 4.5. GPT-4.1 mini stays close enough that the answer can still flip depending on your workload.

Related Comparisons

Explore More

Anthropic Compare Pricing Methodology Find Your Best LLM Overall Rankings
Last updated: July 23, 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.