Claude Fable 5 vs DeepSeek V3.1 Terminus
Head-to-head specifications
| Metric | Claude Fable 5 | DeepSeek V3.1 Terminus | Difference |
|---|---|---|---|
| Intelligence Index | 60.0 | 26.0 | +130.8% |
| Coding Index | 76.5 | 43.5 | +75.9% |
| Agentic Index | 52.8 | 18.1 | — |
| Context window | 1M tokens | 200K tokens | — |
| Blended price ($/1M tokens) | $1.68 | $0.31 | +441.9% |
| Access | Proprietary API | Open weights | — |
- Claude Fable 5 leads overall capability (Intelligence Index 60.0 vs 26.0).
- DeepSeek V3.1 Terminus is the cheaper model to run at $0.31/1M blended tokens — about 5.4× cheaper.
- Claude Fable 5 offers the larger context window (1M tokens), useful for long documents and codebases.
Verdict: Claude Fable 5 or DeepSeek V3.1 Terminus?
Claude Fable 5 advantages
- General intelligence (+57%)
- Coding ability (+43%)
- Agentic task performance (+66%)
- Context window (+80%)
DeepSeek V3.1 Terminus advantages
- Affordability (+82%)
Which should you choose?
- Choose the Claude Fable 5 if you need the strongest overall reasoning and accuracy.
- Choose the DeepSeek V3.1 Terminus if you want the lowest cost per token at scale.
- Choose the Claude Fable 5 if coding and software development are your main workload.
Value for money
DeepSeek V3.1 Terminus offers more intelligence per dollar (2.3× the Intelligence-Index-per-cost of the alternative), making it the stronger value for high-volume use. It is also open-weight, so self-hosting can reduce costs further at scale.
Claude Fable 5 vs DeepSeek V3.1 Terminus: which should you choose?
Claude Fable 5 — Anthropic multimodal model with an Intelligence Index of 60, a 1M-token context window and a blended price of $1.68/1M tokens.
DeepSeek V3.1 Terminus — DeepSeek text model with an Intelligence Index of 26, a 200K-token context window and a blended price of $0.31/1M tokens (open weights).
Claude Fable 5 vs DeepSeek V3.1 Terminus: Claude Fable 5 scores higher on the Intelligence Index. Claude Fable 5 leads overall capability (Intelligence Index 60.0 vs 26.0). DeepSeek V3.1 Terminus is the cheaper model to run at $0.31/1M blended tokens — about 5.4× cheaper.
Capability: intelligence, coding and agentic work
On the composite Intelligence Index the Claude Fable 5 scores 60.0 versus 26.0. For software development, the Coding Index puts Claude Fable 5 ahead (76.5 vs 43.5). On agentic, multi-step tool-use tasks, Claude Fable 5 measures stronger. Composite indices summarize many evaluations, but always test on your own workload before committing.
Context window and speed
The Claude Fable 5 accepts up to 1 million tokens per request, which sets how much documentation, transcript or code it can reason over at once.
Pricing and access
At blended per-token rates, DeepSeek V3.1 Terminus is the cheaper model to run ($0.31 vs $1.68 per 1M tokens). Claude Fable 5 is proprietary api and DeepSeek V3.1 Terminus is open weights. Open-weight models can be self-hosted, trading per-call cost for infrastructure you manage; for production also weigh rate limits, throughput and data-residency requirements.
The verdict
Both are credible choices in the ai model comparison space; the specification table above lays out every metric so you can weigh the trade-offs that matter to you. Pick the one whose strengths line up with how you will actually use it.
Frequently asked questions
Is the Claude Fable 5 better than the DeepSeek V3.1 Terminus?
Claude Fable 5 takes the overall edge, though DeepSeek V3.1 Terminus wins in specific areas worth weighing. Claude Fable 5 leads overall capability (Intelligence Index 60.0 vs 26.0).
What is the main difference between the Claude Fable 5 and the DeepSeek V3.1 Terminus?
Claude Fable 5 leads overall capability (Intelligence Index 60.0 vs 26.0). DeepSeek V3.1 Terminus is the cheaper model to run at $0.31/1M blended tokens — about 5.4× cheaper.
Which is better value?
DeepSeek V3.1 Terminus offers more intelligence per dollar (2.3× the Intelligence-Index-per-cost of the alternative), making it the stronger value for high-volume use. It is also open-weight, so self-hosting can reduce costs further at scale.
Which should I choose?
Choose the Claude Fable 5 if you need the strongest overall reasoning and accuracy. Choose the DeepSeek V3.1 Terminus if you want the lowest cost per token at scale.
Methodology
Large language models are compared on independent leaderboard metrics: an Intelligence Index (a composite of reasoning and knowledge evaluations), Coding and Agentic indices where measured, community arena Elo, maximum context window, a blended API price per million tokens (weighted across cache-hit, input and output rates), and measured output speed in tokens per second. Where a model ships multiple reasoning-effort variants, we report its strongest variant. Benchmarks capture only part of real-world quality, which also depends on tool use, latency, safety and task fit — and this space moves quickly, so figures reflect the leaderboard snapshot on the page date.