Pairwise benchmark snapshot · Aug 16, 2026

Kimi Chat 1.5 vs Seed 2.1 Turbo benchmark

Name: Kimi Chat 1.5 vs Seed 2.1 Turbo AI benchmark comparison
Creator: CompareLLM
License: https://creativecommons.org/licenses/by/4.0/

This page compares Kimi Chat 1.5 (Moonshot) 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 52 points (1,472 vs 1,420; seed-bootstrap (Aug 16, 2026)). On SWE-bench coding, Seed 2.1 Turbo resolves 63.2% versus 51% (seed-bootstrap (Aug 16, 2026)). Seed 2.1 Turbo streams faster (160 tok/s) while Kimi Chat 1.5 is the cheaper output token ($0.8/1M). Kimi Chat 1.5 has the larger context window (2M 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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Moonshot

Kimi Chat 1.5

Moonshot ultra-long context model supporting up to 2 million tokens per request.

Elo 1,420$0.8/1M 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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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.

Kimi Chat 1.5 (3)vsSeed 2.1 Turbo (7)

Kimi Chat 1.5: 3W (30%)Overall: Seed 2.1 TurboSeed 2.1 Turbo: 7W (70%)

← Kimi Chat 1.5Seed 2.1 Turbo →

Seed 2.1 Turbo (5/5)

Intelligence & Reasoning

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

Preference Elo

1,420vs1,472

Coding Elo

1,390vs1,480

SWE-bench

51%vs63.2%

LiveBench

58%vs64.8%

GPQA Diamond

71.5%vs76.8%

Kimi Chat 1.5: 0WSeed 2.1 Turbo: 5W

Seed 2.1 Turbo (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

95 tok/svs160 tok/s

Time to first token

210 msvs120 ms

Kimi Chat 1.5: 0WSeed 2.1 Turbo: 2W

Kimi Chat 1.5 (3/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$0.8/1Mvs$2.5/1M

Input price

$0.2/1Mvs$0.5/1M

Context window

2Mvs262k

Kimi Chat 1.5: 3WSeed 2.1 Turbo: 0W

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 4/6

Preference Elo

Seed 2.1 Turbo

52 pts advantage

Throughput Speed

Seed 2.1 Turbo

65 tok/s faster

Price Efficiency

Kimi Chat 1.5

$1.70/1M cheaper

Full Benchmark Score Matrix

—

Elo

High is better

1,420

EloHigh is better

1,472+4%

Code Elo

High is better

1,390

Code EloHigh is better

1,480+6%

LiveBench

High is better

58%

LiveBenchHigh is better

64.8%+12%

SWE-bench

High is better

51%

SWE-benchHigh is better

63.2%+24%

GPQA

High is better

71.5%

GPQAHigh is better

76.8%+7%

TTFT

Low is better

210 ms

TTFTLow is better

120 ms+75%

Speed

High is better

95 tok/s

SpeedHigh is better

160 tok/s+68%

In $

Low is better

+150%$0.2/1M

In $Low is better

$0.5/1M

Out $

Low is better

+213%$0.8/1M

Out $Low is better

$2.5/1M

Context

High is better

+663%2M

ContextHigh is better

262k

Interactive Simulator

Workload Cost & Savings Calculator

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

Save up to 65% with Kimi Chat 1.5

Monthly Volume50M tokens/mo

Quick Presets:

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

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

Kimi Chat 1.5$19.00 / mo

In: $7.00Out: $12.00

Seed 2.1 Turbo$55.00 / mo

In: $17.50Out: $37.50

Estimated Cost Delta

Kimi Chat 1.5 is estimated to save $36.00/month ($432/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
Kimi Chat 1.5:Pick Kimi Chat 1.5 when you are optimizing output cost.
3
Seed 2.1 Turbo:Pick Seed 2.1 Turbo when time-to-first-token matters more than peak Elo.

Recommended Workload Routing

Repo / coding agentsSeed 2.1 Turbo

Higher SWE-bench (63.2%).

High-volume chatKimi Chat 1.5

Lower output list price ($0.8/1M).

Voice / low-latency UISeed 2.1 Turbo

Lower TTFT (120 ms).

Long-document RAGKimi Chat 1.5

Larger window (2M).

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	Kimi Chat 1.5	Lower output list price ($0.8/1M).
Voice / low-latency UI	Seed 2.1 Turbo	Lower TTFT (120 ms).
Long-document RAG	Kimi Chat 1.5	Larger window (2M).
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 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

Moonshot

Kimi Chat 1.5

Elo 1,420

LiveBench58%

SWE-bench51%

Speed95 tok/s

Output cost$0.8/1M

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, Kimi Chat 1.5 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, Kimi Chat 1.5 or Seed 2.1 Turbo?: Seed 2.1 Turbo leads SWE-bench at 63.2% vs 51%. SWE-bench is one harness, not your repo.
Which is cheaper to run in production?: Kimi Chat 1.5 output tokens are $0.8/1M versus $2.5/1M. Input prices and retry rates still move the real bill.
Which is faster, Kimi Chat 1.5 or Seed 2.1 Turbo?: Seed 2.1 Turbo has the lower time-to-first-token (120 ms vs 210 ms). Tokens/sec is a separate column if you care about long completions.
Which has the larger context window?: Kimi Chat 1.5 accepts 2M tokens versus 262k.
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. Kimi Chat 1.5 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 Kimi Chat 1.5 matchups →|All Seed 2.1 Turbo matchups →

Kimi Chat 1.5 vs MoonshotAI: Kimi K2 0711 (next kimi)Seed 2.1 Turbo vs Doubao Pro 1.5 (previous seed)Kimi K3 vs Seed 2.1 Turbo MoonshotAI: Kimi K2 0711 vs Seed 2.1 Turbo Doubao Lite 1.5 vs Kimi Chat 1.5 MoonshotAI: Kimi K2.5 vs Seed 2.1 Turbo

Kimi Chat 1.5 vs Seed 2.1 Turbo benchmark

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

Kimi Chat 1.5 (3)vsSeed 2.1 Turbo (7)

Kimi Chat 1.5: 3W (30%)Overall: Seed 2.1 TurboSeed 2.1 Turbo: 7W (70%)

← Kimi Chat 1.5Seed 2.1 Turbo →

Seed 2.1 Turbo (5/5)

Intelligence & Reasoning

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

Preference Elo

1,420vs1,472

Coding Elo

1,390vs1,480

SWE-bench

51%vs63.2%

LiveBench

58%vs64.8%

GPQA Diamond

71.5%vs76.8%

Kimi Chat 1.5: 0WSeed 2.1 Turbo: 5W

Seed 2.1 Turbo (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

95 tok/svs160 tok/s

Time to first token

210 msvs120 ms

Kimi Chat 1.5: 0WSeed 2.1 Turbo: 2W

Kimi Chat 1.5 (3/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$0.8/1Mvs$2.5/1M

Input price

$0.2/1Mvs$0.5/1M

Context window

2Mvs262k

Kimi Chat 1.5: 3WSeed 2.1 Turbo: 0W

Recommended Workload Routing

Repo / coding agentsSeed 2.1 Turbo

Higher SWE-bench (63.2%).

High-volume chatKimi Chat 1.5

Lower output list price ($0.8/1M).

Voice / low-latency UISeed 2.1 Turbo

Lower TTFT (120 ms).

Long-document RAGKimi Chat 1.5

Larger window (2M).

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	Kimi Chat 1.5	Lower output list price ($0.8/1M).
Voice / low-latency UI	Seed 2.1 Turbo	Lower TTFT (120 ms).
Long-document RAG	Kimi Chat 1.5	Larger window (2M).
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, Kimi Chat 1.5 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, Kimi Chat 1.5 or Seed 2.1 Turbo?

Seed 2.1 Turbo leads SWE-bench at 63.2% vs 51%. SWE-bench is one harness, not your repo.

Which is cheaper to run in production?

Kimi Chat 1.5 output tokens are $0.8/1M versus $2.5/1M. Input prices and retry rates still move the real bill.

Which is faster, Kimi Chat 1.5 or Seed 2.1 Turbo?

Seed 2.1 Turbo has the lower time-to-first-token (120 ms vs 210 ms). Tokens/sec is a separate column if you care about long completions.

Which has the larger context window?

Kimi Chat 1.5 accepts 2M tokens versus 262k.

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. Kimi Chat 1.5 and Seed 2.1 Turbo 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

Seed 2.1 Turbo

Seed 2.1 Turbo

Kimi Chat 1.5

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

Kimi Chat 1.5

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

Kimi Chat 1.5

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

Kimi Chat 1.5

Seed 2.1 Turbo

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons