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Model comparison

Claude Mythos 5 vs ZAYA1-8B

Data verified

Head-to-head evidence from 1 shared benchmark result across 1 category. Overall scores shown here use the public BenchAlign v5 ranking lane.

83.93/100
No comparison
ZAYA1-8B
Zyphra
N/A
1 category wins1 category wins

Public leaderboard positions: Claude Mythos 5 #1 (Supported); ZAYA1-8B unranked (Not scored). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Claude Mythos 5 and ZAYA1-8B share 1 comparable benchmark result. 2 of 8 categories are comparable. 14 results are unique to Claude Mythos 5; 10 to ZAYA1-8B.

Updated July 23, 2026
Shared results
1
Claude Mythos 5 only
14
ZAYA1-8B only
10
Comparable categories
2 / 8

Treat this as a split decision. Claude Mythos 5 makes more sense if mathematics is the priority or you need the larger 1M+ context window; ZAYA1-8B is the better fit if knowledge is the priority or you want the cheaper token bill.

Confidence note. This is a partial-evidence comparison with 1 shared benchmark result across 1 evidence category; 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 ZAYA1-8B 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 $0.00 input / $0.00 output per 1M tokens for ZAYA1-8B. That is roughly Infinityx on output cost alone. Claude Mythos 5 gives you the larger context window at 1M+, compared with 131K for ZAYA1-8B.

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 ZAYA1-8B
CategoryClaude Mythos 5ΔZAYA1-8B
MathClaude Mythos 597.6Margin← 17.2ZAYA1-8B80.4
KnowledgeClaude Mythos 568.5Margin→ 5.1ZAYA1-8B73.6
AgenticClaude Mythos 587.0MarginNo overlapZAYA1-8BNot measured
CodingClaude Mythos 589.7MarginNo overlapZAYA1-8BNot measured
MultimodalClaude Mythos 593.5MarginNo overlapZAYA1-8BNot measured
Inst. FollowingClaude Mythos 5Not measuredMarginNo overlapZAYA1-8B64.1

Decisive benchmark drivers

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

More
A · Claude Mythos 5B · ZAYA1-8B

  1. GPQA

    Knowledge
    Source ↗
    A 94.1%B 71%
    Winner: Claude Mythos 5Δ 23.1
    GPQA: Claude Mythos 5 scored 94.1%; ZAYA1-8B scored 71%. 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 5ZAYA1-8BComparison
Input / output priceUSD per 1M tokensClaude Mythos 5$10 input / $50 outputZAYA1-8B$0 input / $0 outputZAYA1-8B has the lower combined listed price.
Generation speedtokens per secondClaude Mythos 5Not availableZAYA1-8BNot availableA complete speed comparison is not available.
First-answer latencyseconds to first tokenClaude Mythos 5Not availableZAYA1-8BNot availableA complete latency comparison is not available.
Context windowmaximum listed tokensClaude Mythos 51M+ZAYA1-8B131KClaude Mythos 5 lists the larger context window.

Benchmark Deep Dive

Agentic
BenchmarkClaude Mythos 5ZAYA1-8BResult
Terminal-Bench 2.0Source 88%—Not comparable
OSWorld-VerifiedSource 85%—Not comparable
BrowseCompSource 88%—Not comparable
ExploitGymSource 17.5%—Not comparable
BFCL v4Source —39.2%Not comparable
Coding
BenchmarkClaude Mythos 5ZAYA1-8BResult
SWE-bench VerifiedSource 95.5%—Not comparable
SWE-bench ProSource 80.3%—Not comparable
Terminal-Bench 2.0Source 88.0%—Not comparable
LiveCodeBench v6Source —65.8%Not comparable
KnowledgeZAYA1-8B wins
BenchmarkClaude Mythos 5ZAYA1-8BResult
GPQASource 94.1%71%Claude Mythos 5 leads
HLESource 64.5%—Not comparable
HLE w/o toolsSource 59%—Not comparable
GPQA-DSource —71.0%Not comparable
MMLU-ProSource —74.2%Not comparable
MathClaude Mythos 5 wins
BenchmarkClaude Mythos 5ZAYA1-8BResult
USAMO 2026Source 97.6%—Not comparable
AIME26Source —89.1%Not comparable
HMMT Feb 2026Source —71.6%Not comparable
IMOAnswerBenchSource —59.3%Not comparable
ApexSource —32.2%Not comparable
Multilingual
BenchmarkClaude Mythos 5ZAYA1-8BResult
SWE MultilingualSource 92.2%—Not comparable
Multimodal
BenchmarkClaude Mythos 5ZAYA1-8BResult
SWE-bench MultimodalSource 54.9%—Not comparable
CharXivSource 93.5%—Not comparable
CharXiv w/o toolsSource 88.9%—Not comparable
Inst. Following
BenchmarkClaude Mythos 5ZAYA1-8BResult
IFEvalSource —85.6%Not comparable
IFBenchSource —52.6%Not comparable
Frequently Asked Questions (3)

Which is better, Claude Mythos 5 or ZAYA1-8B?

Claude Mythos 5 and ZAYA1-8B 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 knowledge tasks, Claude Mythos 5 or ZAYA1-8B?

ZAYA1-8B has the edge for knowledge tasks in this comparison, averaging 73.6 versus 68.5. Inside this category, GPQA is the benchmark that creates the most daylight between them.

Which is better for math, Claude Mythos 5 or ZAYA1-8B?

Claude Mythos 5 has the edge for math in this comparison, averaging 97.6 versus 80.4. ZAYA1-8B stays close enough that the answer can still flip depending on your workload.

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