What this model error usually means
DeepSeek: DeepSeek V3.1 Terminus returning 400 / context length exceeded means you should first confirm whether model ID deepseek/deepseek-v3.1-terminus is visible for this DeepSeek key, then separate permission, context, capability, rate limit, or route issues.
- Model: deepseek/deepseek-v3.1-terminus
- Provider: DeepSeek
- Status code: 400