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Model comparison

Claude Sonnet 4.5 vs Llama 3.1 405B

Data verified

Head-to-head evidence from 0 shared benchmark results across 0 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

No sourced benchmark result is currently shared by both models. This page therefore compares only the available metadata, pricing, and runtime rows; it does not name a quality winner.
53.61/100
Margin
1.9pts
← winning
51.71/100
0 category wins0 category wins

Public leaderboard positions: Claude Sonnet 4.5 #96 (Estimated); Llama 3.1 405B #102 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Claude Sonnet 4.5 and Llama 3.1 405B share 0 comparable benchmark results. 0 of 8 categories are comparable. 12 results are unique to Claude Sonnet 4.5; 11 to Llama 3.1 405B.

Updated July 21, 2026
Shared results
0
Claude Sonnet 4.5 only
12
Llama 3.1 405B only
11
Comparable categories
0 / 8

Benchmark data for Claude Sonnet 4.5 and Llama 3.1 405B is coming soon on BenchLM.

Confidence note. This is a partial-evidence comparison with 0 shared benchmark results across 0 evidence categories; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.

Why this result

BenchLM has partial data for these models, but not enough overlapping benchmark coverage to produce a fair score-level comparison yet.

Claude Sonnet 4.5 is priced at $3.00 input / $15.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for Llama 3.1 405B. Claude Sonnet 4.5 has the larger context window at 200K, compared with 128K for Llama 3.1 405B.

Operational comparison

Runtime and commercial metrics are compared only when both models have a complete sourced value.

MetricClaude Sonnet 4.5Llama 3.1 405BComparison
Input / output priceUSD per 1M tokensClaude Sonnet 4.5$3 input / $15 outputLlama 3.1 405B$0 input / $0 outputLlama 3.1 405B has the lower combined listed price.
Generation speedtokens per secondClaude Sonnet 4.5Not availableLlama 3.1 405B29 tok/sA complete speed comparison is not available.
First-answer latencyseconds to first tokenClaude Sonnet 4.5Not availableLlama 3.1 405B2.19 sA complete latency comparison is not available.
Context windowmaximum listed tokensClaude Sonnet 4.5200KLlama 3.1 405B128KClaude Sonnet 4.5 lists the larger context window.

Benchmark Deep Dive

Agentic
BenchmarkClaude Sonnet 4.5Llama 3.1 405BResult
Terminal-Bench 2.0Source 50%—Not comparable
OSWorld-VerifiedSource 61.4%—Not comparable
VITA-BenchSource 17.0%—Not comparable
Gert LabsSource 48.51%—Not comparable
JobBenchSource 27.7%—Not comparable
τ²-bench resultsSource —19%Not comparable
Coding
BenchmarkClaude Sonnet 4.5Llama 3.1 405BResult
SWE-bench VerifiedSource 77.2%—Not comparable
AA-SciCodeSource —29.9%Not comparable
Reasoning
BenchmarkClaude Sonnet 4.5Llama 3.1 405BResult
ARC-AGI-2Source 13.6%—Not comparable
AA-LCRSource —24.3%Not comparable
CritPtSource —0.0%Not comparable
Knowledge
BenchmarkClaude Sonnet 4.5Llama 3.1 405BResult
GPQASource 83.4%—Not comparable
Artificial Analysis Intelligence IndexSource —8.5%Not comparable
AA-GPQA DiamondSource —51.5%Not comparable
AA-HLESource —4.2%Not comparable
AA-Omniscience IndexSource —-17.3%Not comparable
AA-Omniscience AccuracySource —22.3%Not comparable
AA-Omniscience Hallucination RateSource —51.0%Not comparable
Math
BenchmarkClaude Sonnet 4.5Llama 3.1 405BResult
AIME 2025Source 87%—Not comparable
FrontierMath v2 (Tiers 1-3)Source 13.495%—Not comparable
FrontierMath v2 (Tier 4)Source 4.167%—Not comparable
Multimodal
BenchmarkClaude Sonnet 4.5Llama 3.1 405BResult
Design Arena WebsiteSource 1219—Not comparable
Inst. Following
BenchmarkClaude Sonnet 4.5Llama 3.1 405BResult
AA-IFBenchSource —39.0%Not comparable
Frequently Asked Questions (3)

Can I compare Claude Sonnet 4.5 and Llama 3.1 405B on BenchLM yet?

Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.

Why does this comparison show “coming soon”?

BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.

What data is available for Claude Sonnet 4.5 and Llama 3.1 405B today?

Claude Sonnet 4.5: $3.00 input / $15.00 output per 1M tokens Llama 3.1 405B: $0.00 input / $0.00 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.

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