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Head-to-head comparison

Claude Fable 5.1 vs DeepSeek V4 Flash 0731

Claude Fable 5.1 (Anthropic) and DeepSeek V4 Flash 0731 (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 Fable 5.1 holds the stronger ModelCap Index position (#3 vs #24); DeepSeek V4 Flash 0731 is 277.8× cheaper per output token ($0.18/1M vs $50.00/1M); DeepSeek V4 Flash 0731 offers the longer context window (1.3M vs 1M tokens); and DeepSeek V4 Flash 0731 ships open weights.

Which should you choose?

Choose Claude Fable 5.1 if…

  • you want the stronger overall ModelCap Index position — #3 against #24 (87.7 vs 70.7 points).
  • ARC-AGI-2 is your yardstick — 90.0% against 61.4%.
  • AA Intelligence Index is your yardstick — 53.4 against 34.5.
  • AA Terminal-Bench 2.1 is your yardstick — 91.4% against 78.7%.
  • AA Humanity's Last Exam is your yardstick — 59.1% against 38.6%.
  • you want the more recently listed model — Claude Fable 5.1 was listed 1 September 2026, DeepSeek V4 Flash 0731 31 July 2026.

Choose DeepSeek V4 Flash 0731 if…

  • API cost matters — $0.18/1M output tokens against $50.00/1M, about 277.8× cheaper.
  • your workload is prompt-heavy — input tokens cost $0.065/1M against $10.00/1M.
  • you need the longer context window — 1.3M tokens against 1M.
  • you want to self-host: DeepSeek V4 Flash 0731 ships open weights while Claude Fable 5.1 is api only.
  • you want provider choice — 28 listed API providers against 4.

Claude Fable 5.1 vs DeepSeek V4 Flash 0731: specs, pricing and context

Specification comparison of Claude Fable 5.1 and DeepSeek V4 Flash 0731
FieldClaude Fable 5.1AnthropicDeepSeek V4 Flash 0731DeepSeek
ModelCap Index position#3#24
Index score87.770.7
EvidenceMeasuredMeasured
Input price / 1M tokens$10.00$0.065
Output price / 1M tokens$50.00$0.18
Context window1M tokens1.3M tokens
Max output tokens128K944K
API providers listed428
Weight accessAPI onlyOpen weights
Input modalitiesText, Image, FileText
First listed1 September 202631 July 2026
PublisherAnthropicDeepSeek

Evidence: 5 public benchmark observations across 5 boards · 2 public benchmark observations across 2 boards. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: Claude Fable 5.1 vs DeepSeek V4 Flash 0731

Public benchmark boards where Claude Fable 5.1 or DeepSeek V4 Flash 0731 has a published result
BoardClaude Fable 5.1DeepSeek V4 Flash 0731Leads
Arena codingArena (LMArena)15171491–1542Max—Only one result
LMArena AgentLMArena14.5%12.6%–16.4%Max—Only one result
ARC-AGI-2ARC Prize Foundation90.0%Max61.4%MaxClaude Fable 5.1
AA Intelligence IndexArtificial Analysis53.4intelligence-index:v4.3:reasoning-unspecified34.5intelligence-index:v4.3:maxClaude Fable 5.1
AA Terminal-Bench 2.1Artificial Analysis91.4%terminal-bench:2.1:terminus-2:e2b:pass-at-1:3-repeats:source-model="Claude Fable 5.1 (max with fallback)":reasoning=true78.7%terminal-bench:2.1:terminus-2:e2b:pass-at-1:3-repeats:source-model="DeepSeek V4 Flash 0731 (max)":reasoning=trueClaude Fable 5.1
AA Humanity's Last ExamArtificial Analysis59.1%hle:may-2025:text-only-2158:no-tools:pass-at-1:source-model="Claude Fable 5.1 (max with fallback)":reasoning=true38.6%hle:may-2025:text-only-2158:no-tools:pass-at-1:source-model="DeepSeek V4 Flash 0731 (max)":reasoning=trueClaude Fable 5.1
Terminal-Bench 4.0Terminal-Bench (Laude Institute)57.9%54.1%–61.6%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 Fable 5.1 vs DeepSeek V4 Flash 0731: common questions

Is Claude Fable 5.1 better than DeepSeek V4 Flash 0731?

Claude Fable 5.1 ranks higher on the ModelCap Index as of 9 September 2026: #3 against #24. 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 Fable 5.1 cheaper than DeepSeek V4 Flash 0731?

DeepSeek V4 Flash 0731 is cheaper on output tokens: $0.18/1M against $50.00/1M. Input tokens are $10.00/1M for Claude Fable 5.1 and $0.065/1M for DeepSeek V4 Flash 0731. 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 $45.00 for Claude Fable 5.1 versus $0.22 for DeepSeek V4 Flash 0731. DeepSeek V4 Flash 0731 costs 99.5% 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 Fable 5.1 or DeepSeek V4 Flash 0731?

DeepSeek V4 Flash 0731 has the larger context window: 1.3M tokens against 1M.

Which is better for coding, Claude Fable 5.1 or DeepSeek V4 Flash 0731?

AA Terminal-Bench 2.1: Claude Fable 5.1 91.4%, DeepSeek V4 Flash 0731 78.7% — Claude Fable 5.1 leads.

Are Claude Fable 5.1 and DeepSeek V4 Flash 0731 open-weight models?

Claude Fable 5.1: API only. DeepSeek V4 Flash 0731: 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 Fable 5.1 and DeepSeek V4 Flash 0731?

ModelCap currently lists 4 API providers for Claude Fable 5.1 and 28 for DeepSeek V4 Flash 0731, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this Claude Fable 5.1 vs DeepSeek V4 Flash 0731 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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