Pairwise benchmark snapshot · Aug 16, 2026

Claude 3.5 Haiku vs Seed 2.1 Turbo benchmark

Name: Claude 3.5 Haiku vs Seed 2.1 Turbo AI benchmark comparison
Creator: CompareLLM
License: https://creativecommons.org/licenses/by/4.0/

This page compares Claude 3.5 Haiku (Anthropic) 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 248 points (1,472 vs 1,224; seed-bootstrap (Aug 16, 2026)). On SWE-bench coding, Seed 2.1 Turbo resolves 63.2% versus 36.2% (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). Seed 2.1 Turbo 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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Anthropic

Claude 3.5 Haiku

Previous cheap Claude. Haiku 4.5 is the current $1/$5 SKU.

Elo 1,224$4/1M 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 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 3.5 Haiku (1)vsSeed 2.1 Turbo (9)

Claude 3.5 Haiku: 1W (10%)Overall: Seed 2.1 TurboSeed 2.1 Turbo: 9W (90%)

← Claude 3.5 HaikuSeed 2.1 Turbo →

Seed 2.1 Turbo (5/5)

Intelligence & Reasoning

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

Preference Elo

1,224vs1,472

Coding Elo

—vs1,480

SWE-bench

36.2%vs63.2%

LiveBench

44.8%vs64.8%

GPQA Diamond

54.1%vs76.8%

Claude 3.5 Haiku: 0WSeed 2.1 Turbo: 5W

Tied (1/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

140 tok/svs160 tok/s

Time to first token

110 msvs120 ms

Claude 3.5 Haiku: 1WSeed 2.1 Turbo: 1W

Seed 2.1 Turbo (3/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$4/1Mvs$2.5/1M

Input price

$0.8/1Mvs$0.5/1M

Context window

200kvs262k

Claude 3.5 Haiku: 0WSeed 2.1 Turbo: 3W

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 6/6

Preference Elo

Seed 2.1 Turbo

248 pts advantage

Throughput Speed

Seed 2.1 Turbo

20 tok/s faster

Price Efficiency

Seed 2.1 Turbo

$1.50/1M cheaper

Full Benchmark Score Matrix

—

Elo

High is better

1,224

EloHigh is better

1,472+20%

Code Elo

High is better

—

Code EloHigh is better

1,480

LiveBench

High is better

44.8%

LiveBenchHigh is better

64.8%+45%

SWE-bench

High is better

36.2%

SWE-benchHigh is better

63.2%+75%

GPQA

High is better

54.1%

GPQAHigh is better

76.8%+42%

TTFT

Low is better

+9%110 ms

TTFTLow is better

120 ms

Speed

High is better

140 tok/s

SpeedHigh is better

160 tok/s+14%

In $

Low is better

$0.8/1M

In $Low is better

$0.5/1M+60%

Out $

Low is better

$4/1M

Out $Low is better

$2.5/1M+60%

Context

High is better

200k

ContextHigh is better

262k+31%

Interactive Simulator

Workload Cost & Savings Calculator

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

Save up to 38% 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)

Claude 3.5 Haiku$88.00 / mo

In: $28.00Out: $60.00

Seed 2.1 Turbo$55.00 / mo

In: $17.50Out: $37.50

Estimated Cost Delta

Seed 2.1 Turbo is estimated to save $33.00/month ($396/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
Claude 3.5 Haiku:Pick Claude 3.5 Haiku 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 UIClaude 3.5 Haiku

Lower TTFT (110 ms).

Long-document RAGSeed 2.1 Turbo

Larger window (262k).

Screenshots / visionSeed 2.1 Turbo

Both accept images. Defaulting to the higher-Elo side (Seed 2.1 Turbo).

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	Claude 3.5 Haiku	Lower TTFT (110 ms).
Long-document RAG	Seed 2.1 Turbo	Larger window (262k).
Screenshots / vision	Seed 2.1 Turbo	Both accept images. Defaulting to the higher-Elo side (Seed 2.1 Turbo).

Related Editorial Dispatches & Benchmark Notes

View all news

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

Anthropic

Claude 3.5 Haiku

Elo 1,224

LiveBench44.8%

SWE-bench36.2%

Speed140 tok/s

Output cost$4/1M

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, Claude 3.5 Haiku 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, Claude 3.5 Haiku or Seed 2.1 Turbo?: Seed 2.1 Turbo leads SWE-bench at 63.2% vs 36.2%. 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 $4/1M. Input prices and retry rates still move the real bill.
Which is faster, Claude 3.5 Haiku or Seed 2.1 Turbo?: Claude 3.5 Haiku has the lower time-to-first-token (110 ms vs 120 ms). Tokens/sec is a separate column if you care about long completions.
Which has the larger context window?: Seed 2.1 Turbo accepts 262k tokens versus 200k.
Can I self-host either model?: Neither model is marked open-weights here. You are comparing hosted APIs.
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 3.5 Haiku 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 Claude 3.5 Haiku matchups →|All Seed 2.1 Turbo matchups →

Claude 3.5 Haiku vs Claude Haiku 4.5 (next haiku)Seed 2.1 Turbo vs Doubao Pro 1.5 (previous seed)Claude Opus 4.5 vs Seed 2.1 Turbo Claude Opus 4.6 vs Seed 2.1 Turbo Claude Sonnet 4.5 vs Seed 2.1 Turbo Claude Opus 5 vs Seed 2.1 Turbo

Claude 3.5 Haiku vs Seed 2.1 Turbo benchmark

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

Claude 3.5 Haiku (1)vsSeed 2.1 Turbo (9)

Claude 3.5 Haiku: 1W (10%)Overall: Seed 2.1 TurboSeed 2.1 Turbo: 9W (90%)

← Claude 3.5 HaikuSeed 2.1 Turbo →

Seed 2.1 Turbo (5/5)

Intelligence & Reasoning

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

Preference Elo

1,224vs1,472

Coding Elo

—vs1,480

SWE-bench

36.2%vs63.2%

LiveBench

44.8%vs64.8%

GPQA Diamond

54.1%vs76.8%

Claude 3.5 Haiku: 0WSeed 2.1 Turbo: 5W

Tied (1/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

140 tok/svs160 tok/s

Time to first token

110 msvs120 ms

Claude 3.5 Haiku: 1WSeed 2.1 Turbo: 1W

Seed 2.1 Turbo (3/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$4/1Mvs$2.5/1M

Input price

$0.8/1Mvs$0.5/1M

Context window

200kvs262k

Claude 3.5 Haiku: 0WSeed 2.1 Turbo: 3W

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 UIClaude 3.5 Haiku

Lower TTFT (110 ms).

Long-document RAGSeed 2.1 Turbo

Larger window (262k).

Screenshots / visionSeed 2.1 Turbo

Both accept images. Defaulting to the higher-Elo side (Seed 2.1 Turbo).

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	Claude 3.5 Haiku	Lower TTFT (110 ms).
Long-document RAG	Seed 2.1 Turbo	Larger window (262k).
Screenshots / vision	Seed 2.1 Turbo	Both accept images. Defaulting to the higher-Elo side (Seed 2.1 Turbo).

Frequently Asked Questions

Which is better overall, Claude 3.5 Haiku 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, Claude 3.5 Haiku or Seed 2.1 Turbo?

Seed 2.1 Turbo leads SWE-bench at 63.2% vs 36.2%. 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 $4/1M. Input prices and retry rates still move the real bill.

Which is faster, Claude 3.5 Haiku or Seed 2.1 Turbo?

Claude 3.5 Haiku has the lower time-to-first-token (110 ms vs 120 ms). Tokens/sec is a separate column if you care about long completions.

Which has the larger context window?

Seed 2.1 Turbo accepts 262k tokens versus 200k.

Can I self-host either model?

Neither model is marked open-weights here. You are comparing hosted APIs.

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 3.5 Haiku 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

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

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CompareLLM Matrix

Claude 3.5 Haiku

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

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

Cast Your Matchup Vote

Community Discussions (0)

Share card

CompareLLM Matrix

Claude 3.5 Haiku

Seed 2.1 Turbo

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons