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Head-to-head comparison

Claude Sonnet 5 vs DeepSeek V4 Pro 0813

Claude Sonnet 5 (Anthropic) and DeepSeek V4 Pro 0813 (DeepSeek) compared on the ModelCap Index, API price, context window, provider availability, weight access and every public benchmark board they share. Figures are the same ones shown on the live rankings; nothing here is a hidden score.

Snapshot as of 9 September 2026

As of 9 September 2026, Claude Sonnet 5 holds the stronger ModelCap Index position (#23 vs #25); DeepSeek V4 Pro 0813 is 5.8× cheaper per output token ($1.74/1M vs $10.00/1M); and DeepSeek V4 Pro 0813 ships open weights.

Which should you choose?

Choose Claude Sonnet 5 if…

  • you want the stronger overall ModelCap Index position — #23 against #25 (75.6 vs 73.6 points).
  • Arena coding is your yardstick — 1521 against 1505.
  • AA Intelligence Index is your yardstick — 38.4 against 36.3.
  • AA Terminal-Bench 2.1 is your yardstick — 80.5% against 78.7%.
  • AA Humanity's Last Exam is your yardstick — 41.3% against 41.0%.

Choose DeepSeek V4 Pro 0813 if…

  • API cost matters — $1.74/1M output tokens against $10.00/1M, about 5.8× cheaper.
  • your workload is prompt-heavy — input tokens cost $0.579/1M against $2.00/1M.
  • you want to self-host: DeepSeek V4 Pro 0813 ships open weights while Claude Sonnet 5 is api only.
  • you want provider choice — 19 listed API providers against 5.
  • you want the more recently listed model — DeepSeek V4 Pro 0813 was listed 12 August 2026, Claude Sonnet 5 30 June 2026.

Claude Sonnet 5 vs DeepSeek V4 Pro 0813: specs, pricing and context

Specification comparison of Claude Sonnet 5 and DeepSeek V4 Pro 0813
FieldClaude Sonnet 5AnthropicDeepSeek V4 Pro 0813DeepSeek
ModelCap Index position#23#25
Index score75.673.6
EvidenceMeasuredMeasured
Input price / 1M tokens$2.00$0.579
Output price / 1M tokens$10.00$1.74
Context window1M tokens1M tokens
Max output tokens128K393K
API providers listed519
Weight accessAPI onlyOpen weights
Input modalitiesText, Image, FileText
First listed30 June 202612 August 2026
PublisherAnthropicDeepSeek

Evidence: 4 public benchmark observations across 4 boards · 4 public benchmark observations across 4 boards. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: Claude Sonnet 5 vs DeepSeek V4 Pro 0813

Public benchmark boards where Claude Sonnet 5 or DeepSeek V4 Pro 0813 has a published result
BoardClaude Sonnet 5DeepSeek V4 Pro 0813Leads
Arena codingArena (LMArena)15211514–1529High15051490–1519HighClaude Sonnet 5
LMArena AgentLMArena6.3%4.4%–8.2%High—Only one result
ARC-AGI-2ARC Prize Foundation—61.3%MaxOnly one result
AA Intelligence IndexArtificial Analysis38.4intelligence-index:v4.3:max36.3intelligence-index:v4.3:maxClaude Sonnet 5
AA Terminal-Bench 2.1Artificial Analysis80.5%terminal-bench:2.1:terminus-2:e2b:pass-at-1:3-repeats:source-model="Claude Sonnet 5 (max)":reasoning=true78.7%terminal-bench:2.1:terminus-2:e2b:pass-at-1:3-repeats:source-model="DeepSeek V4 Pro 0813 (max)":reasoning=trueClaude Sonnet 5
AA Humanity's Last ExamArtificial Analysis41.3%hle:may-2025:text-only-2158:no-tools:pass-at-1:source-model="Claude Sonnet 5 (max)":reasoning=true41.0%hle:may-2025:text-only-2158:no-tools:pass-at-1:source-model="DeepSeek V4 Pro 0813 (max)":reasoning=trueClaude Sonnet 5
Terminal-Bench 4.0Terminal-Bench (Laude Institute)12.4%9.4%–15.5%Claude Code · Max—Only one result

Scores are the sources' own published figures for each model's best evaluated configuration; ModelCap never re-runs a benchmark.

Want a different pairing? Open the interactive comparison tool to swap either model for any current ranked language model.

Claude Sonnet 5 vs DeepSeek V4 Pro 0813: common questions

Is Claude Sonnet 5 better than DeepSeek V4 Pro 0813?

Claude Sonnet 5 ranks higher on the ModelCap Index as of 9 September 2026: #23 against #25. That is a capability ranking built from public benchmark evidence with published uncertainty; whether it is "better" for you also depends on price, context and where you can run it. Their published uncertainty intervals overlap, so the rank difference alone does not establish a reliable capability advantage for your workload.

Is Claude Sonnet 5 cheaper than DeepSeek V4 Pro 0813?

DeepSeek V4 Pro 0813 is cheaper on output tokens: $1.74/1M against $10.00/1M. Input tokens are $2.00/1M for Claude Sonnet 5 and $0.579/1M for DeepSeek V4 Pro 0813. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens. For 1,000 requests with 2,000 input and 500 output tokens each (2M input + 0.5M output), the listed-rate estimate is $9.00 for Claude Sonnet 5 versus $2.03 for DeepSeek V4 Pro 0813. DeepSeek V4 Pro 0813 costs 77.5% less in this scenario. This excludes caching, batch discounts, prompt-length tiers, tool charges and retries; verify the selected endpoint before budgeting.

Which has the bigger context window, Claude Sonnet 5 or DeepSeek V4 Pro 0813?

Both publish a 1M-token context window.

Which is better for coding, Claude Sonnet 5 or DeepSeek V4 Pro 0813?

Arena coding: Claude Sonnet 5 1521, DeepSeek V4 Pro 0813 1505 — Claude Sonnet 5 leads. AA Terminal-Bench 2.1: Claude Sonnet 5 80.5%, DeepSeek V4 Pro 0813 78.7% — Claude Sonnet 5 leads.

Are Claude Sonnet 5 and DeepSeek V4 Pro 0813 open-weight models?

Claude Sonnet 5: API only. DeepSeek V4 Pro 0813: Open weights. Open weights mean the checkpoint can be downloaded and self-hosted under its licence; API-only models are available solely through hosted endpoints.

Where can I run Claude Sonnet 5 and DeepSeek V4 Pro 0813?

ModelCap currently lists 5 API providers for Claude Sonnet 5 and 19 for DeepSeek V4 Pro 0813, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this Claude Sonnet 5 vs DeepSeek V4 Pro 0813 comparison?

Every figure comes from the sealed ModelCap dataset published 9 September 2026; the page re-renders within a minute of each data refresh, and the ModelCap Index positions are the same ones shown on the live rankings.

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