The Known Good Updated 4 Sep 2026 Subscribe
claude-sonnet-4-5-20250929 vs DeepSeek: DeepSeek V3 ·Anthropic vs DeepSeek

claude-sonnet-4-5-20250929 vs DeepSeek: DeepSeek V3 — head-to-head comparison

claude-sonnet-4-5-20250929 profile DeepSeek: DeepSeek V3 profile All comparisons
claude-sonnet-4-5-20250929 — Anthropic
Quality
#36 of 65
66based on 6 of 7 evaluations
Known Good Index
Speed
unranked
—
Output tokens per second
Price
unranked
—
Blended per 1M tokens
Cache hit price
unranked
—
per 1M tokens
Context
unranked
—
tokens
DeepSeek: DeepSeek V3 — DeepSeek
Quality
#43 of 65
62based on 4 of 7 evaluations
Known Good Index
Speed
#302 of 338
21.8
Output tokens per second
Price
#152 of 442
$0.46
Blended per 1M tokens
In $0.32 · Out $0.89
Cache hit price
#60 of 324
$0.020
per 1M tokens (−94%)
Context
#335 of 476
164k
tokens (~300 pages)
Summary

On the Known Good Index, claude-sonnet-4-5-20250929 scores 66 and DeepSeek: DeepSeek V3 scores 62 — a 4-point lead for claude-sonnet-4-5-20250929. They share 3 published evaluations, with claude-sonnet-4-5-20250929 ahead on 3 and DeepSeek: DeepSeek V3 ahead on 0.

Published pricing is tracked for DeepSeek: DeepSeek V3 only, at $0.46 per 1M tokens blended.

claude-sonnet-4-5-20250929 is proprietary; DeepSeek: DeepSeek V3 is open weights under Open weights (unrestricted). 3 tracked hosts serve one or both.

Generated from tracked data on 4 Sep 2026 · how these comparisons are computed →

At a glance
Metricclaude-sonnet-4-5-20250929DeepSeek: DeepSeek V3
Known Good Index 66 based on 6 of 7 evaluations 62 based on 4 of 7 evaluations
Blended $/1M — $0.46
Output tok/s — 22
Context window — 164k
Providers 0 3
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Quality

Known Good Index and the capability indices, side by side

Index scores

Each index is min-max normalised across tracked models and scaled 0–100 from published evaluations. We do not run these evaluations.

Metricclaude-sonnet-4-5-20250929DeepSeek: DeepSeek V3
Known Good Index 66 62
Coding Index 63 —
Mathematics Index 89 57
Reasoning Index 47 62
Openness Index 5 60
The Known Good

Quality Breakdown

Every evaluation both models report a published score for

Evaluations both models report

Bar = claude-sonnet-4-5-20250929 · marker = DeepSeek: DeepSeek V3 · scores ingested from Epoch AI (CC-BY 4.0)

GPQA Diamond82 / 71
Mock AIME 2024–2578 / 49
MATH Level 598 / 65

Right-hand figures read claude-sonnet-4-5-20250929 / DeepSeek: DeepSeek V3. claude-sonnet-4-5-20250929 leads on 3 of 3, DeepSeek: DeepSeek V3 on 0.

The Known Good

Arena Elo

Human preference rating from blind pairwise votes

Arena ratings

Elo from blind pairwise votes, ingested from Arena. Higher is better.

Metricclaude-sonnet-4-5-20250929DeepSeek: DeepSeek V3
Text Arena 1,438 1,332
Text Arena (style controlled) 1,455 1,358
The Known Good

Price & Cost

Published API pricing by token type

Published pricing

USD per 1M tokens. Blended is a 3:1 input:output mix. Live from OpenRouter, cross-checked against models.dev. Lower is better.

Metricclaude-sonnet-4-5-20250929DeepSeek: DeepSeek V3
Input $/1M — $0.32
Output $/1M — $0.89
Blended $/1M — $0.46
Cache read $/1M — $0.020
The Known Good
We publish blended price rather than cost-per-task. Cost-per-task requires token counts from an evaluation suite we do not run. Blended price is computed from published rates and is fully reproducible — see the pricing methodology.

Context Window

Maximum input accepted and maximum output emitted

Context and output limits

Provider-declared limits, from metadata via models.dev and OpenRouter. Higher is better.

Metricclaude-sonnet-4-5-20250929DeepSeek: DeepSeek V3
Context window — 164k
Max output tokens — 16k
The Known Good

Speed & Latency

Mean throughput and time to first token across hosting providers, over successful measurements from the last 48 hours

Throughput and latency

Means across all tracked providers over successful measurements from the last 48 hours, derived from OpenRouter endpoint telemetry.

Metricclaude-sonnet-4-5-20250929DeepSeek: DeepSeek V3
Output tokens/s — 22
Time to first token — 1.2s
The Known Good

Providers

Which hosts serve each model, and at what price and speed

3 hosts
Full provider benchmarks →
Provider claude-sonnet-4-5-20250929 blendedclaude-sonnet-4-5-20250929 tok/s DeepSeek: DeepSeek V3 blendedDeepSeek: DeepSeek V3 tok/s
StreamLake — — $0.45 24
Novita — — $0.62 17
DeepInfra — — $0.46 11

Per-host pricing and telemetry from OpenRouter. A dash means that host does not serve that model.

The Known Good
Sources for this page
Pricing & providers — OpenRouter Metadata — models.dev Benchmarks — Epoch AI (CC-BY 4.0)Elo — Arena Full attribution →