Claude Fable 5.1 vs DeepSeek-V4-Pro-0813: Specs & Benchmark Comparison
Claude Fable 5.1 is developed by Anthropic, while DeepSeek-V4-Pro-0813 comes from DeepSeek. DeepSeek-V4-Pro-0813 was released in August 2026, and Claude Fable 5.1 followed a month later in September 2026. DeepSeek-V4-Pro-0813 has a published size of about 1.6 trillion parameters; Anthropic has not disclosed the parameter count of Claude Fable 5.1.
The two models share 2 published benchmarks. They split them evenly, 1 to 1. The widest gaps are on Humanity's Last Exam, where Claude Fable 5.1 scores 65.0% against 60.0%; AutomationBench, where DeepSeek-V4-Pro-0813 scores 31.8% against 31.4%. Averaged across everything we track, Claude Fable 5.1 sits at 59.7% and DeepSeek-V4-Pro-0813 at 60.6%.
DeepSeek-V4-Pro-0813 is the cheaper API at $1.32 per million input tokens and $3.96 per million output tokens, roughly 8 times cheaper than Claude Fable 5.1 at $10 and $50. Both accept a context window of about 1M tokens. Claude Fable 5.1 accepts text and images as input, while DeepSeek-V4-Pro-0813 accepts text.
| Characteristic | Claude Fable 5.1 | DeepSeek-V4-Pro-0813 |
|---|---|---|
| Company | Anthropic | DeepSeek |
| Release Date | September 1, 2026 | August 13, 2026 |
| Parameters | — | 1.6T |
| Multimodal | Yes | No |
| Context (input) | 1.0M | 1.0M |
| Context (output) | 128K | 393K |
| Input Price / 1M | $10.00 | $1.32 |
| Output Price / 1M | $50.00 | $3.96 |
| Average Score | 59.7% | 60.6% |
| Benchmarks | ||
| Humanity's Last Exam | 65.0% | 60.0% |
| AutomationBench | 31.4% | 31.8% |
Visual Benchmark Comparison
Verdict
Both models show equal results — the choice depends on your specific use case.
Both models show comparable average scores: Claude Fable 5.1 — 0.6, DeepSeek-V4-Pro-0813 — 0.6.
DeepSeek-V4-Pro-0813 is 11.4x cheaper: input $1.32/1M vs $10.00/1M tokens.
Same context size: 1M tokens.
Claude Fable 5.1 is newer: released 9/1/2026 vs 8/13/2026.
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Frequently Asked Questions
Which is better for coding — Claude Fable 5.1 or DeepSeek-V4-Pro-0813?
Which model is cheaper — Claude Fable 5.1 or DeepSeek-V4-Pro-0813?
Which has a larger context window — Claude Fable 5.1 or DeepSeek-V4-Pro-0813?
The Claude Fable 5.1 and DeepSeek-V4-Pro-0813 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Claude Fable 5.1 or DeepSeek-V4-Pro-0813 page. See also the complete list of AI model comparisons.