Pairwise benchmark snapshot · Aug 16, 2026

Claude Sonnet 5 vs Qwen3.8 27B benchmark

Name: Claude Sonnet 5 vs Qwen3.8 27B AI benchmark comparison
Creator: CompareLLM
License: https://creativecommons.org/licenses/by/4.0/

This page compares Claude Sonnet 5 (Anthropic) and Qwen3.8 27B (Alibaba) using the latest snapshots we have as of Aug 16, 2026. On preference Elo, Claude Sonnet 5 is ahead by 158 points (1,556 vs 1,398; seed-bootstrap (Aug 16, 2026)). On SWE-bench coding, Claude Sonnet 5 resolves 73.8% versus 58.8% (seed-bootstrap (Aug 16, 2026)). Qwen3.8 27B streams faster (152 tok/s) while Qwen3.8 27B is the cheaper output token ($3.2/1M). Claude Sonnet 5 has the larger context window (1M tokens). Every cell below is a dated snapshot from a named public source — we do not invent missing scores, and we do not run SWE-bench ourselves.

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Anthropic

Claude Sonnet 5

Anthropic workhorse. Official $2/$10 per 1M tokens made permanent on Aug 10 2026.

Elo 1,556$10/1M out

Alibaba

Qwen3.8 27B

Alibaba open-weight 27B drop dated Aug 14 2026. Dense enough to self-host; not a frontier MoE.

Elo 1,398$3.1999999999999997/1M out

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Model A

Model B

Quick vs:vs Claude Opus 4.5 vs Claude Opus 4.6 vs Claude Sonnet 4.5 vs Claude 3.7 Sonnet

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

Claude Sonnet 5 (6)vsQwen3.8 27B (4)

Claude Sonnet 5: 6W (60%)Overall: Claude Sonnet 5Qwen3.8 27B: 4W (40%)

← Claude Sonnet 5Qwen3.8 27B →

Claude Sonnet 5 (5/5)

Intelligence & Reasoning

Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy

Preference Elo

1,556vs1,398

Coding Elo

1,562vs1,422

SWE-bench

73.8%vs58.8%

LiveBench

70.4%vs60.6%

GPQA Diamond

82.8%vs73.4%

Claude Sonnet 5: 5WQwen3.8 27B: 0W

Qwen3.8 27B (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

118 tok/svs152 tok/s

Time to first token

175 msvs140 ms

Claude Sonnet 5: 0WQwen3.8 27B: 2W

Qwen3.8 27B (2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$10/1Mvs$3.2/1M

Input price

$2/1Mvs$0.45/1M

Context window

1Mvs262k

Claude Sonnet 5: 1WQwen3.8 27B: 2W

Capability Matchup Radar

Multi-Dimensional Capability Radar

Each spoke is a skill. Farther from the center is better (0–100th percentile). Tap any dot to inspect details.

Tap any node to inspect

Percentile 0–100

Dimensional AdvantageClaude Sonnet 5 4/6

Preference Elo

Claude Sonnet 5

158 pts advantage

Throughput Speed

Qwen3.8 27B

34 tok/s faster

Price Efficiency

Qwen3.8 27B

$6.80/1M cheaper

Full Benchmark Score Matrix

—

Elo

High is better

+11%1,556

EloHigh is better

1,398

Code Elo

High is better

+10%1,562

Code EloHigh is better

1,422

LiveBench

High is better

+16%70.4%

LiveBenchHigh is better

60.6%

SWE-bench

High is better

+26%73.8%

SWE-benchHigh is better

58.8%

GPQA

High is better

+13%82.8%

GPQAHigh is better

73.4%

TTFT

Low is better

175 ms

TTFTLow is better

140 ms+25%

Speed

High is better

118 tok/s

SpeedHigh is better

152 tok/s+29%

In $

Low is better

$2/1M

In $Low is better

$0.45/1M+344%

Out $

Low is better

$10/1M

Out $Low is better

$3.2/1M+213%

Context

High is better

+281%1M

ContextHigh is better

262k

Interactive Simulator

Workload Cost & Savings Calculator

Simulate monthly production API costs based on published $/1M tokens.

Save up to 71% with Qwen3.8 27B

Monthly Volume50M tokens/mo

Quick Presets:

Token Ratio (In vs Out)70% In / 30% Out

RAG / Search (10% out)Coding / Chat (50% out)

Claude Sonnet 5$220.00 / mo

In: $70.00Out: $150.00

Qwen3.8 27B$63.75 / mo

In: $15.75Out: $48.00

Estimated Cost Delta

Qwen3.8 27B is estimated to save $156.25/month ($1,875/year).

Based on 50M tokens (30% gen)

Key Selection Recommendations

1
Claude Sonnet 5:Pick Claude Sonnet 5 when repo-level coding accuracy is the constraint.
2
Qwen3.8 27B:Pick Qwen3.8 27B when you are optimizing output cost.
3
Qwen3.8 27B:Pick Qwen3.8 27B when time-to-first-token matters more than peak Elo.

Recommended Workload Routing

Repo / coding agentsClaude Sonnet 5

Higher SWE-bench (73.8%).

High-volume chatQwen3.8 27B

Lower output list price ($3.2/1M).

Voice / low-latency UIQwen3.8 27B

Lower TTFT (140 ms).

Long-document RAGClaude Sonnet 5

Larger window (1M).

Screenshots / visionClaude Sonnet 5

Claude Sonnet 5 is the side marked multimodal in the catalog.

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	Claude Sonnet 5	Higher SWE-bench (73.8%).
High-volume chat	Qwen3.8 27B	Lower output list price ($3.2/1M).
Voice / low-latency UI	Qwen3.8 27B	Lower TTFT (140 ms).
Long-document RAG	Claude Sonnet 5	Larger window (1M).
Screenshots / vision	Claude Sonnet 5	Claude Sonnet 5 is the side marked multimodal in the catalog.

Related Editorial Dispatches & Benchmark Notes

View all news

launchAug 14, 2026

Qwen3.8 27B (Aug 14): dense enough to self-host, not a frontier MoE

Alibaba open-weight 27B drop. Local/open-weight lists should see it. It will not win frontier-agents.

compareAug 10, 2026

Sonnet vs Opus in 2026: same family, different invoice

Usually Sonnet 5 vs Opus 5. Coding delta versus output $/1M. The workhorse question.

priceAug 10, 2026

Claude Sonnet 5 at $2/$10: the 2026 Anthropic workhorse

Aug 10 2026 made the $2/$10 list permanent. Sonnet is the default Claude unless the repo is actually on fire.

launchFeb 18, 2026

Claude Sonnet 4.5 is the previous workhorse — still a valid vs baseline

Most of Opus 4.5 coding at a mid-tier price. Sonnet 5 replaced it as the buy; 4.5 remains a compare baseline.

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LIVE

Anthropic

Claude Sonnet 5

Elo 1,556

LiveBench70.4%

SWE-bench73.8%

Speed118 tok/s

Output cost$10/1M

Alibaba

Qwen3.8 27B

Elo 1,398

LiveBench60.6%

SWE-bench58.8%

Speed152 tok/s

Output cost$3.2/1M

Frequently Asked Questions

Which is better overall, Claude Sonnet 5 or Qwen3.8 27B?: Claude Sonnet 5 has the higher preference Elo in our latest snapshot (1,556). “Better” still depends on coding, price, and latency — see the table.
Which is better at coding, Claude Sonnet 5 or Qwen3.8 27B?: Claude Sonnet 5 leads SWE-bench at 73.8% vs 58.8%. SWE-bench is one harness, not your repo.
Which is cheaper to run in production?: Qwen3.8 27B output tokens are $3.2/1M versus $10/1M. Input prices and retry rates still move the real bill.
Which is faster, Claude Sonnet 5 or Qwen3.8 27B?: Qwen3.8 27B has the lower time-to-first-token (140 ms vs 175 ms). Tokens/sec is a separate column if you care about long completions.
Which has the larger context window?: Claude Sonnet 5 accepts 1M tokens versus 262k.
Can I self-host either model?: Qwen3.8 27B is marked open-weights in our catalog. The other side is a closed API. Check the provider license before you ship weights.
Are these scores from CompareLLM’s own evals?: No. V1 aggregates public leaderboards (and optional first-party latency pings). Each cell names its source and date. Read /methodology.
What does preference Elo mean on this page?: Preference Elo is a crowd vote from LMArena / Arena. People see two hidden answers and pick the one they like more. The model that wins more often gets a higher Elo. That means people preferred it — not that it passed a school test. It is not SWE-bench, not accuracy, and not a number we invent. Claude Sonnet 5 and Qwen3.8 27B Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Similar Head-to-Head Comparisons

All Claude Sonnet 5 matchups →|All Qwen3.8 27B matchups →

Claude Sonnet 5 vs Claude Sonnet 4.5 (previous sonnet)Qwen3.8 27B vs Qwen 3 Max (previous qwen)Claude Opus 4.5 vs Claude Sonnet 5 Claude Opus 4.6 vs Claude Sonnet 5 Qwen 3 Max vs Claude Sonnet 5 Claude Opus 4.8 vs Claude Sonnet 5

Claude Sonnet 5 vs Qwen3.8 27B benchmark

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

Claude Sonnet 5 (6)vsQwen3.8 27B (4)

Claude Sonnet 5: 6W (60%)Overall: Claude Sonnet 5Qwen3.8 27B: 4W (40%)

← Claude Sonnet 5Qwen3.8 27B →

Claude Sonnet 5 (5/5)

Intelligence & Reasoning

Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy

Preference Elo

1,556vs1,398

Coding Elo

1,562vs1,422

SWE-bench

73.8%vs58.8%

LiveBench

70.4%vs60.6%

GPQA Diamond

82.8%vs73.4%

Claude Sonnet 5: 5WQwen3.8 27B: 0W

Qwen3.8 27B (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

118 tok/svs152 tok/s

Time to first token

175 msvs140 ms

Claude Sonnet 5: 0WQwen3.8 27B: 2W

Qwen3.8 27B (2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$10/1Mvs$3.2/1M

Input price

$2/1Mvs$0.45/1M

Context window

1Mvs262k

Claude Sonnet 5: 1WQwen3.8 27B: 2W

Recommended Workload Routing

Repo / coding agentsClaude Sonnet 5

Higher SWE-bench (73.8%).

High-volume chatQwen3.8 27B

Lower output list price ($3.2/1M).

Voice / low-latency UIQwen3.8 27B

Lower TTFT (140 ms).

Long-document RAGClaude Sonnet 5

Larger window (1M).

Screenshots / visionClaude Sonnet 5

Claude Sonnet 5 is the side marked multimodal in the catalog.

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	Claude Sonnet 5	Higher SWE-bench (73.8%).
High-volume chat	Qwen3.8 27B	Lower output list price ($3.2/1M).
Voice / low-latency UI	Qwen3.8 27B	Lower TTFT (140 ms).
Long-document RAG	Claude Sonnet 5	Larger window (1M).
Screenshots / vision	Claude Sonnet 5	Claude Sonnet 5 is the side marked multimodal in the catalog.

Frequently Asked Questions

Which is better overall, Claude Sonnet 5 or Qwen3.8 27B?

Claude Sonnet 5 has the higher preference Elo in our latest snapshot (1,556). “Better” still depends on coding, price, and latency — see the table.

Which is better at coding, Claude Sonnet 5 or Qwen3.8 27B?

Claude Sonnet 5 leads SWE-bench at 73.8% vs 58.8%. SWE-bench is one harness, not your repo.

Which is cheaper to run in production?

Qwen3.8 27B output tokens are $3.2/1M versus $10/1M. Input prices and retry rates still move the real bill.

Which is faster, Claude Sonnet 5 or Qwen3.8 27B?

Qwen3.8 27B has the lower time-to-first-token (140 ms vs 175 ms). Tokens/sec is a separate column if you care about long completions.

Which has the larger context window?

Claude Sonnet 5 accepts 1M tokens versus 262k.

Can I self-host either model?

Qwen3.8 27B is marked open-weights in our catalog. The other side is a closed API. Check the provider license before you ship weights.

Are these scores from CompareLLM’s own evals?

No. V1 aggregates public leaderboards (and optional first-party latency pings). Each cell names its source and date. Read /methodology.

What does preference Elo mean on this page?

Preference Elo is a crowd vote from LMArena / Arena. People see two hidden answers and pick the one they like more. The model that wins more often gets a higher Elo. That means people preferred it — not that it passed a school test. It is not SWE-bench, not accuracy, and not a number we invent. Claude Sonnet 5 and Qwen3.8 27B Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Swap or Add Any Model to this Matchup

Interactive Comparison Diagram

Tug-of-War Matchup Matrix

Intelligence & Reasoning

Speed & Latency

Pricing & Capacity

Multi-Dimensional Capability Radar

Claude Sonnet 5

Qwen3.8 27B

Qwen3.8 27B

Full Benchmark Score Matrix

Workload Cost & Savings Calculator

Key Selection Recommendations

Recommended Workload Routing

Related Editorial Dispatches & Benchmark Notes

Qwen3.8 27B (Aug 14): dense enough to self-host, not a frontier MoE

Sonnet vs Opus in 2026: same family, different invoice

Claude Sonnet 5 at $2/$10: the 2026 Anthropic workhorse

Claude Sonnet 4.5 is the previous workhorse — still a valid vs baseline

Cast Your Matchup Vote

Community Discussions (0)

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CompareLLM Matrix

Claude Sonnet 5

Qwen3.8 27B

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons

Swap or Add Any Model to this Matchup

Interactive Comparison Diagram

Tug-of-War Matchup Matrix

Intelligence & Reasoning

Speed & Latency

Pricing & Capacity

Multi-Dimensional Capability Radar

Claude Sonnet 5

Qwen3.8 27B

Qwen3.8 27B

Full Benchmark Score Matrix

Workload Cost & Savings Calculator

Key Selection Recommendations

Recommended Workload Routing

Related Editorial Dispatches & Benchmark Notes

Qwen3.8 27B (Aug 14): dense enough to self-host, not a frontier MoE

Sonnet vs Opus in 2026: same family, different invoice

Claude Sonnet 5 at $2/$10: the 2026 Anthropic workhorse

Claude Sonnet 4.5 is the previous workhorse — still a valid vs baseline

Cast Your Matchup Vote

Community Discussions (0)

Share card

CompareLLM Matrix

Claude Sonnet 5

Qwen3.8 27B

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons