The Known Good Updated 25 Jul 2026
claude-sonnet-4-5-20250929 vs DeepSeek: R1 ·Anthropic vs DeepSeek

claude-sonnet-4-5-20250929 vs DeepSeek: R1 — head-to-head comparison

claude-sonnet-4-5-20250929 profile DeepSeek: R1 profile All comparisons
claude-sonnet-4-5-20250929 — Anthropic
Quality
#36 of 61
59based on 5 of 6 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: R1 — DeepSeek
Quality
#24 of 61
68based on 3 of 6 evaluations
Known Good Index
Speed
#165 of 316
49.3
Output tokens per second
Price
#209 of 340
$1.15
Blended per 1M tokens
In $0.70 · Out $2.50
Cache hit price
unranked
—
per 1M tokens
Context
#219 of 345
164k
tokens (~300 pages)
Summary

On the Known Good Index, claude-sonnet-4-5-20250929 scores 59 and DeepSeek: R1 scores 68 — a 9-point lead for DeepSeek: R1. They share 3 published evaluations, with claude-sonnet-4-5-20250929 ahead on 3 and DeepSeek: R1 ahead on 0.

Published pricing is tracked for DeepSeek: R1 only, at $1.15 per 1M tokens blended.

claude-sonnet-4-5-20250929 is proprietary; DeepSeek: R1 is open weights under Open weights (unrestricted). 2 tracked hosts serve one or both.

Generated from tracked data on 25 Jul 2026 · how these comparisons are computed →

At a glance
Metricclaude-sonnet-4-5-20250929DeepSeek: R1
Known Good Index 59 based on 5 of 6 evaluations 68 based on 3 of 6 evaluations
Blended $/1M — $1.15
Output tok/s — 49
Context window — 164k
Providers 0 2
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Quality

Known Good Index and the capability indices, side by side

IndicesComponents
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: R1
Known Good Index 59 68
Coding Index 61 —
Mathematics Index 89 74
Science Index 84 69
Reasoning Index 48 77
Agentic Index 61 —
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: R1 · scores ingested from Epoch AI (CC-BY 4.0)

GPQA Diamond82 / 69
MATH / AIME78 / 53
MATH Level 598 / 93

Right-hand figures read claude-sonnet-4-5-20250929 / DeepSeek: R1. claude-sonnet-4-5-20250929 leads on 3 of 3, DeepSeek: R1 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: R1
Text Arena 1,438 1,373
Text Arena (style controlled) 1,455 1,398
The Known Good

Price & Cost

Published API pricing by token type

Per token typeCache discount
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: R1
Input $/1M — $0.70
Output $/1M — $2.50
Blended $/1M — $1.15
Cache read $/1M — —
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: R1
Context window — 164k
Max output tokens — 16k
The Known Good

Speed & Latency

Median throughput and time to first token across hosting providers

Output speedTime to first token
Throughput and latency

Medians across all tracked providers, derived from OpenRouter endpoint telemetry.

Metricclaude-sonnet-4-5-20250929DeepSeek: R1
Output tokens/s — 49
Time to first token — 1.1s
The Known Good

Providers

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

2 hosts
Full provider benchmarks →
Provider claude-sonnet-4-5-20250929 blendedclaude-sonnet-4-5-20250929 tok/s DeepSeek: R1 blendedDeepSeek: R1 tok/s
Azure · first party — — $2.60 77
Novita — — $1.15 22

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 →