Pairwise benchmark snapshot · Aug 16, 2026

Qwen 2.5 Plus vs Qwen3.8 27B benchmark

Name: Qwen 2.5 Plus vs Qwen3.8 27B AI benchmark comparison
Creator: CompareLLM
License: https://creativecommons.org/licenses/by/4.0/

This page compares Qwen 2.5 Plus (Alibaba) and Qwen3.8 27B (Alibaba) using the latest snapshots we have as of Aug 16, 2026. On preference Elo, Qwen 2.5 Plus is ahead by 47 points (1,445 vs 1,398; seed-bootstrap (Aug 1, 2026)). On SWE-bench coding, Qwen 2.5 Plus resolves 59.2% versus 58.8% (seed-bootstrap (Aug 1, 2026)). Qwen3.8 27B streams faster (152 tok/s) while Qwen 2.5 Plus is the cheaper output token ($1/1M). Qwen3.8 27B has the larger context window (262k 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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Alibaba

Qwen 2.5 Plus

Alibaba balanced flagship API model with high-throughput general reasoning.

Elo 1,445$1/1M 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.

Qwen 2.5 Plus (7)vsQwen3.8 27B (3)

Qwen 2.5 Plus: 7W (70%)Overall: Qwen 2.5 PlusQwen3.8 27B: 3W (30%)

← Qwen 2.5 PlusQwen3.8 27B →

Qwen 2.5 Plus (5/5)

Intelligence & Reasoning

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

Preference Elo

1,445vs1,398

Coding Elo

1,460vs1,422

SWE-bench

59.2%vs58.8%

LiveBench

63.5%vs60.6%

GPQA Diamond

75.8%vs73.4%

Qwen 2.5 Plus: 5WQwen3.8 27B: 0W

Qwen3.8 27B (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

110 tok/svs152 tok/s

Time to first token

180 msvs140 ms

Qwen 2.5 Plus: 0WQwen3.8 27B: 2W

Qwen 2.5 Plus (2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$1/1Mvs$3.2/1M

Input price

$0.25/1Mvs$0.45/1M

Context window

128kvs262k

Qwen 2.5 Plus: 2WQwen3.8 27B: 1W

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 AdvantageQwen 2.5 Plus 4/6

Preference Elo

Qwen 2.5 Plus

47 pts advantage

Throughput Speed

Qwen3.8 27B

42 tok/s faster

Price Efficiency

Qwen 2.5 Plus

$2.20/1M cheaper

Full Benchmark Score Matrix

—

Elo

High is better

+3%1,445

EloHigh is better

1,398

Code Elo

High is better

+3%1,460

Code EloHigh is better

1,422

LiveBench

High is better

+5%63.5%

LiveBenchHigh is better

60.6%

SWE-bench

High is better

+1%59.2%

SWE-benchHigh is better

58.8%

GPQA

High is better

+3%75.8%

GPQAHigh is better

73.4%

TTFT

Low is better

180 ms

TTFTLow is better

140 ms+29%

Speed

High is better

110 tok/s

SpeedHigh is better

152 tok/s+38%

In $

Low is better

+80%$0.25/1M

In $Low is better

$0.45/1M

Out $

Low is better

+220%$1/1M

Out $Low is better

$3.2/1M

Context

High is better

128k

ContextHigh is better

262k+105%

Interactive Simulator

Workload Cost & Savings Calculator

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

Save up to 63% with Qwen 2.5 Plus

Monthly Volume50M tokens/mo

Quick Presets:

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

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

Qwen 2.5 Plus$23.75 / mo

In: $8.75Out: $15.00

Qwen3.8 27B$63.75 / mo

In: $15.75Out: $48.00

Estimated Cost Delta

Qwen 2.5 Plus is estimated to save $40.00/month ($480/year).

Based on 50M tokens (30% gen)

Key Selection Recommendations

1
Qwen 2.5 Plus:Pick Qwen 2.5 Plus when repo-level coding accuracy is the constraint.
2
Qwen3.8 27B:Pick Qwen3.8 27B when time-to-first-token matters more than peak Elo.
3
Qwen 2.5 Plus:Pick Qwen 2.5 Plus as the default general assistant.

Recommended Workload Routing

Repo / coding agentsQwen 2.5 Plus

Higher SWE-bench (59.2%).

High-volume chatQwen 2.5 Plus

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

Voice / low-latency UIQwen3.8 27B

Lower TTFT (140 ms).

Long-document RAGQwen3.8 27B

Larger window (262k).

Screenshots / visionQwen 2.5 Plus

Qwen 2.5 Plus is the side marked multimodal in the catalog.

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	Qwen 2.5 Plus	Higher SWE-bench (59.2%).
High-volume chat	Qwen 2.5 Plus	Lower output list price ($1/1M).
Voice / low-latency UI	Qwen3.8 27B	Lower TTFT (140 ms).
Long-document RAG	Qwen3.8 27B	Larger window (262k).
Screenshots / vision	Qwen 2.5 Plus	Qwen 2.5 Plus 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.

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LIVE

Alibaba

Qwen 2.5 Plus

Elo 1,445

LiveBench63.5%

SWE-bench59.2%

Speed110 tok/s

Output cost$1/1M

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, Qwen 2.5 Plus or Qwen3.8 27B?: Qwen 2.5 Plus has the higher preference Elo in our latest snapshot (1,445). “Better” still depends on coding, price, and latency — see the table.
Which is better at coding, Qwen 2.5 Plus or Qwen3.8 27B?: Qwen 2.5 Plus leads SWE-bench at 59.2% vs 58.8%. SWE-bench is one harness, not your repo.
Which is cheaper to run in production?: Qwen 2.5 Plus output tokens are $1/1M versus $3.2/1M. Input prices and retry rates still move the real bill.
Which is faster, Qwen 2.5 Plus or Qwen3.8 27B?: Qwen3.8 27B has the lower time-to-first-token (140 ms vs 180 ms). Tokens/sec is a separate column if you care about long completions.
Which has the larger context window?: Qwen3.8 27B accepts 262k tokens versus 128k.
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. Qwen 2.5 Plus 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 Qwen 2.5 Plus matchups →|All Qwen3.8 27B matchups →

Qwen 2.5 Plus vs Qwen 2.5 Coder 32B (next qwen)Qwen3.8 27B vs Qwen 3 Max (previous qwen)Qwen QwQ 32B vs Qwen 2.5 Plus Qwen 3 Max vs Qwen 2.5 Plus Qwen3 235B vs Qwen 2.5 Plus Mistral Large 3 vs Qwen 2.5 Plus

Qwen 2.5 Plus vs Qwen3.8 27B benchmark

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

Qwen 2.5 Plus (7)vsQwen3.8 27B (3)

Qwen 2.5 Plus: 7W (70%)Overall: Qwen 2.5 PlusQwen3.8 27B: 3W (30%)

← Qwen 2.5 PlusQwen3.8 27B →

Qwen 2.5 Plus (5/5)

Intelligence & Reasoning

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

Preference Elo

1,445vs1,398

Coding Elo

1,460vs1,422

SWE-bench

59.2%vs58.8%

LiveBench

63.5%vs60.6%

GPQA Diamond

75.8%vs73.4%

Qwen 2.5 Plus: 5WQwen3.8 27B: 0W

Qwen3.8 27B (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

110 tok/svs152 tok/s

Time to first token

180 msvs140 ms

Qwen 2.5 Plus: 0WQwen3.8 27B: 2W

Qwen 2.5 Plus (2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$1/1Mvs$3.2/1M

Input price

$0.25/1Mvs$0.45/1M

Context window

128kvs262k

Qwen 2.5 Plus: 2WQwen3.8 27B: 1W

Recommended Workload Routing

Repo / coding agentsQwen 2.5 Plus

Higher SWE-bench (59.2%).

High-volume chatQwen 2.5 Plus

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

Voice / low-latency UIQwen3.8 27B

Lower TTFT (140 ms).

Long-document RAGQwen3.8 27B

Larger window (262k).

Screenshots / visionQwen 2.5 Plus

Qwen 2.5 Plus is the side marked multimodal in the catalog.

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	Qwen 2.5 Plus	Higher SWE-bench (59.2%).
High-volume chat	Qwen 2.5 Plus	Lower output list price ($1/1M).
Voice / low-latency UI	Qwen3.8 27B	Lower TTFT (140 ms).
Long-document RAG	Qwen3.8 27B	Larger window (262k).
Screenshots / vision	Qwen 2.5 Plus	Qwen 2.5 Plus is the side marked multimodal in the catalog.

Frequently Asked Questions

Which is better overall, Qwen 2.5 Plus or Qwen3.8 27B?

Qwen 2.5 Plus has the higher preference Elo in our latest snapshot (1,445). “Better” still depends on coding, price, and latency — see the table.

Which is better at coding, Qwen 2.5 Plus or Qwen3.8 27B?

Qwen 2.5 Plus leads SWE-bench at 59.2% vs 58.8%. SWE-bench is one harness, not your repo.

Which is cheaper to run in production?

Qwen 2.5 Plus output tokens are $1/1M versus $3.2/1M. Input prices and retry rates still move the real bill.

Which is faster, Qwen 2.5 Plus or Qwen3.8 27B?

Qwen3.8 27B has the lower time-to-first-token (140 ms vs 180 ms). Tokens/sec is a separate column if you care about long completions.

Which has the larger context window?

Qwen3.8 27B accepts 262k tokens versus 128k.

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. Qwen 2.5 Plus and Qwen3.8 27B Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

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Interactive Comparison Diagram

Tug-of-War Matchup Matrix

Intelligence & Reasoning

Speed & Latency

Pricing & Capacity

Multi-Dimensional Capability Radar

Qwen 2.5 Plus

Qwen3.8 27B

Qwen 2.5 Plus

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

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CompareLLM Matrix

Qwen 2.5 Plus

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

Qwen 2.5 Plus

Qwen3.8 27B

Qwen 2.5 Plus

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

Cast Your Matchup Vote

Community Discussions (0)

Share card

CompareLLM Matrix

Qwen 2.5 Plus

Qwen3.8 27B

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons