Pairwise benchmark snapshot · Aug 16, 2026

Qwen3.8 27B vs Seed 2.1 Turbo benchmark

Name: Qwen3.8 27B vs Seed 2.1 Turbo AI benchmark comparison
Creator: CompareLLM
License: https://creativecommons.org/licenses/by/4.0/

This page compares Qwen3.8 27B (Alibaba) and Seed 2.1 Turbo (ByteDance) using the latest snapshots we have as of Aug 16, 2026. On preference Elo, Seed 2.1 Turbo is ahead by 74 points (1,472 vs 1,398; seed-bootstrap (Aug 16, 2026)). On SWE-bench coding, Seed 2.1 Turbo resolves 63.2% versus 58.8% (seed-bootstrap (Aug 16, 2026)). Seed 2.1 Turbo streams faster (160 tok/s) while Seed 2.1 Turbo is the cheaper output token ($2.5/1M). 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

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

ByteDance

Seed 2.1 Turbo

ByteDance Seed 2.1 Turbo, listed on public model timelines as an Aug 10 2026 API drop.

Elo 1,472$2.5/1M out

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Model B

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Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

Qwen3.8 27B (1)vsSeed 2.1 Turbo (8)

Qwen3.8 27B: 1W (11%)Overall: Seed 2.1 TurboSeed 2.1 Turbo: 8W (89%)

← Qwen3.8 27B1 tiesSeed 2.1 Turbo →

Seed 2.1 Turbo (5/5)

Intelligence & Reasoning

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

Preference Elo

1,398vs1,472

Coding Elo

1,422vs1,480

SWE-bench

58.8%vs63.2%

LiveBench

60.6%vs64.8%

GPQA Diamond

73.4%vs76.8%

Qwen3.8 27B: 0WSeed 2.1 Turbo: 5W

Seed 2.1 Turbo (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

152 tok/svs160 tok/s

Time to first token

140 msvs120 ms

Qwen3.8 27B: 0WSeed 2.1 Turbo: 2W

Tied (1/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$3.2/1Mvs$2.5/1M

Input price

$0.45/1Mvs$0.5/1M

Context window

262kvs262k

Qwen3.8 27B: 1WSeed 2.1 Turbo: 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 AdvantageSeed 2.1 Turbo 5/6

Preference Elo

Seed 2.1 Turbo

74 pts advantage

Throughput Speed

Seed 2.1 Turbo

8 tok/s faster

Price Efficiency

Seed 2.1 Turbo

$0.70/1M cheaper

Full Benchmark Score Matrix

—

Elo

High is better

1,398

EloHigh is better

1,472+5%

Code Elo

High is better

1,422

Code EloHigh is better

1,480+4%

LiveBench

High is better

60.6%

LiveBenchHigh is better

64.8%+7%

SWE-bench

High is better

58.8%

SWE-benchHigh is better

63.2%+7%

GPQA

High is better

73.4%

GPQAHigh is better

76.8%+5%

TTFT

Low is better

140 ms

TTFTLow is better

120 ms+17%

Speed

High is better

152 tok/s

SpeedHigh is better

160 tok/s+5%

In $

Low is better

+11%$0.45/1M

In $Low is better

$0.5/1M

Out $

Low is better

$3.2/1M

Out $Low is better

$2.5/1M+28%

Context

High is better

262k

ContextHigh is better

262k

Interactive Simulator

Workload Cost & Savings Calculator

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

Save up to 14% with Seed 2.1 Turbo

Monthly Volume50M tokens/mo

Quick Presets:

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

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

Qwen3.8 27B$63.75 / mo

In: $15.75Out: $48.00

Seed 2.1 Turbo$55.00 / mo

In: $17.50Out: $37.50

Estimated Cost Delta

Seed 2.1 Turbo is estimated to save $8.75/month ($105/year).

Based on 50M tokens (30% gen)

Key Selection Recommendations

1
Seed 2.1 Turbo:Pick Seed 2.1 Turbo when repo-level coding accuracy is the constraint.
2
Seed 2.1 Turbo:Pick Seed 2.1 Turbo when time-to-first-token matters more than peak Elo.
3
Seed 2.1 Turbo:Pick Seed 2.1 Turbo as the default general assistant.

Recommended Workload Routing

Repo / coding agentsSeed 2.1 Turbo

Higher SWE-bench (63.2%).

High-volume chatSeed 2.1 Turbo

Lower output list price ($2.5/1M).

Voice / low-latency UISeed 2.1 Turbo

Lower TTFT (120 ms).

Long-document RAGQwen3.8 27B

Larger window (262k).

Screenshots / visionSeed 2.1 Turbo

Seed 2.1 Turbo is the side marked multimodal in the catalog.

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	Seed 2.1 Turbo	Higher SWE-bench (63.2%).
High-volume chat	Seed 2.1 Turbo	Lower output list price ($2.5/1M).
Voice / low-latency UI	Seed 2.1 Turbo	Lower TTFT (120 ms).
Long-document RAG	Qwen3.8 27B	Larger window (262k).
Screenshots / vision	Seed 2.1 Turbo	Seed 2.1 Turbo 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.

launchAug 10, 2026

Seed 2.1 Turbo (Aug 10): ByteDance’s API drop on the public timeline

Listed on public model timelines as an Aug 10 2026 API drop. Preview-quality story, indexable because we have a full snapshot.

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LIVE

Alibaba

Qwen3.8 27B

Elo 1,398

LiveBench60.6%

SWE-bench58.8%

Speed152 tok/s

Output cost$3.2/1M

ByteDance

Seed 2.1 Turbo

Elo 1,472

LiveBench64.8%

SWE-bench63.2%

Speed160 tok/s

Output cost$2.5/1M

Frequently Asked Questions

Which is better overall, Qwen3.8 27B or Seed 2.1 Turbo?: Seed 2.1 Turbo has the higher preference Elo in our latest snapshot (1,472). “Better” still depends on coding, price, and latency — see the table.
Which is better at coding, Qwen3.8 27B or Seed 2.1 Turbo?: Seed 2.1 Turbo leads SWE-bench at 63.2% vs 58.8%. SWE-bench is one harness, not your repo.
Which is cheaper to run in production?: Seed 2.1 Turbo output tokens are $2.5/1M versus $3.2/1M. Input prices and retry rates still move the real bill.
Which is faster, Qwen3.8 27B or Seed 2.1 Turbo?: Seed 2.1 Turbo has the lower time-to-first-token (120 ms vs 140 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 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. Qwen3.8 27B and Seed 2.1 Turbo Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Similar Head-to-Head Comparisons

All Qwen3.8 27B matchups →|All Seed 2.1 Turbo matchups →

Qwen3.8 27B vs Qwen 3 Max (previous qwen)Seed 2.1 Turbo vs Doubao Pro 1.5 (previous seed)Qwen QwQ 32B vs Seed 2.1 Turbo Qwen 3 Max vs Seed 2.1 Turbo Qwen 2.5 Coder 32B vs Qwen3.8 27B Doubao Lite 1.5 vs Qwen3.8 27B

Qwen3.8 27B vs Seed 2.1 Turbo benchmark

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

Qwen3.8 27B (1)vsSeed 2.1 Turbo (8)

Qwen3.8 27B: 1W (11%)Overall: Seed 2.1 TurboSeed 2.1 Turbo: 8W (89%)

← Qwen3.8 27B1 tiesSeed 2.1 Turbo →

Seed 2.1 Turbo (5/5)

Intelligence & Reasoning

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

Preference Elo

1,398vs1,472

Coding Elo

1,422vs1,480

SWE-bench

58.8%vs63.2%

LiveBench

60.6%vs64.8%

GPQA Diamond

73.4%vs76.8%

Qwen3.8 27B: 0WSeed 2.1 Turbo: 5W

Seed 2.1 Turbo (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

152 tok/svs160 tok/s

Time to first token

140 msvs120 ms

Qwen3.8 27B: 0WSeed 2.1 Turbo: 2W

Tied (1/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$3.2/1Mvs$2.5/1M

Input price

$0.45/1Mvs$0.5/1M

Context window

262kvs262k

Qwen3.8 27B: 1WSeed 2.1 Turbo: 1W

Recommended Workload Routing

Repo / coding agentsSeed 2.1 Turbo

Higher SWE-bench (63.2%).

High-volume chatSeed 2.1 Turbo

Lower output list price ($2.5/1M).

Voice / low-latency UISeed 2.1 Turbo

Lower TTFT (120 ms).

Long-document RAGQwen3.8 27B

Larger window (262k).

Screenshots / visionSeed 2.1 Turbo

Seed 2.1 Turbo is the side marked multimodal in the catalog.

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	Seed 2.1 Turbo	Higher SWE-bench (63.2%).
High-volume chat	Seed 2.1 Turbo	Lower output list price ($2.5/1M).
Voice / low-latency UI	Seed 2.1 Turbo	Lower TTFT (120 ms).
Long-document RAG	Qwen3.8 27B	Larger window (262k).
Screenshots / vision	Seed 2.1 Turbo	Seed 2.1 Turbo is the side marked multimodal in the catalog.

Frequently Asked Questions

Which is better overall, Qwen3.8 27B or Seed 2.1 Turbo?

Seed 2.1 Turbo has the higher preference Elo in our latest snapshot (1,472). “Better” still depends on coding, price, and latency — see the table.

Which is better at coding, Qwen3.8 27B or Seed 2.1 Turbo?

Seed 2.1 Turbo leads SWE-bench at 63.2% vs 58.8%. SWE-bench is one harness, not your repo.

Which is cheaper to run in production?

Seed 2.1 Turbo output tokens are $2.5/1M versus $3.2/1M. Input prices and retry rates still move the real bill.

Which is faster, Qwen3.8 27B or Seed 2.1 Turbo?

Seed 2.1 Turbo has the lower time-to-first-token (120 ms vs 140 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 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. Qwen3.8 27B and Seed 2.1 Turbo 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

Seed 2.1 Turbo

Seed 2.1 Turbo

Seed 2.1 Turbo

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

Seed 2.1 Turbo (Aug 10): ByteDance’s API drop on the public timeline

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CompareLLM Matrix

Qwen3.8 27B

Seed 2.1 Turbo

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

Seed 2.1 Turbo

Seed 2.1 Turbo

Seed 2.1 Turbo

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

Seed 2.1 Turbo (Aug 10): ByteDance’s API drop on the public timeline

Cast Your Matchup Vote

Community Discussions (0)

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CompareLLM Matrix

Qwen3.8 27B

Seed 2.1 Turbo

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons