DeepSeek
The open-weight family everyone else gets benchmarked against.
DeepSeek publishes the weights for nearly everything it ships, which is why its models became the price anchor for the whole market — a Flash model here costs a fraction of a frontier model and gets close on reasoning and code. The V4 line is a sparse mixture-of-experts design with a million-token context. This row is the model family; DeepSeek's own free chat app has its own entry in Chats.
At a glance — DeepSeek V3.1 Terminus
- Cost
- $0.27 in · $1.00 out per 1M tokensBudget
- Memory
- 164K tokens — about 250 pages
- Reads
- Text
- Can do
- Use tools (agents)
- Structured output
- Thinking mode
- Good at
- Coding: better than 43% · Agentic work: better than 32% · Overall: better than 27%
- Reliability
- 100.00% uptime, last 24h
- Released
- Sep 22, 2025
Advanced details
- API model ID
deepseek/deepseek-v3.1-terminus- Max output
- 33K tokens
- Cached input
- $0.135 per 1M
- Knowledge cutoff
- 2025-03-31
- Tokenizer
- DeepSeek
- Coding index
- 43.5
- Agentic work index
- 6.8
- Overall index
- 14.8
Providers
The same model, hosted by different companies. OpenRouter picks one per request and falls back to the next if it fails.
| Provider | Input /1M | Output /1M | Cached /1M | Max output | Uptime 24h |
|---|---|---|---|---|---|
| SiliconFlow · fp8 | $0.27 | $1.00 | — | 147K | 98.25% |
| Novita · fp8 | $0.27 | $1.00 | $0.135 | 33K | 100.00% |
| AtlasCloud · fp8 | $0.30 | $0.95 | $0.13 | 66K | 98.97% |
| StreamLake | $0.343 | $1.028 | — | 32K | 99.81% |
Supported parameters
- frequency_penalty
- include_reasoning
- logit_bias
- max_tokens
- min_p
- presence_penalty
- reasoning
- repetition_penalty
- response_format
- seed
- stop
- structured_outputs
- temperature
- tool_choice
- tools
- top_k
- top_p
Live from OpenRouter, refreshed hourly. Scores from Artificial Analysis.
Key info
- Pricing
- Open source
- Category
- Models
- Best for
- Intermediate
- Made by
- DeepSeek
- Weights
- Open
- Good for
- Reasoning and code at a fraction of frontier prices