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Amazon Nova 2 Lite

amazonamazon/nova-2-lite

API 使用指南

Chat 调用

通过 TheRouter 的 OpenAI 兼容接口调用 Nova 2 Lite。TheRouter 在上游处理 Bedrock InvokeModel / Converse 的协议转换，客户端继续按 OpenAI 形态写。

cURL
curl https://api.therouter.ai/v1/chat/completions \
  -H "Authorization: Bearer $THEROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "amazon/nova-2-lite",
    "messages": [{"role": "user", "content": "Summarise this 200-page PDF in 5 bullets."}]
  }'

流式输出

为聊天界面做流式输出。开启 extended thinking 后首 token 延迟随预算档位升高而增加，流式可以在生成开始后掩盖延迟。

cURL
curl https://api.therouter.ai/v1/chat/completions \
  -H "Authorization: Bearer $THEROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "amazon/nova-2-lite",
    "stream": true,
    "messages": [{"role": "user", "content": "Explain DSA attention in 200 words."}]
  }'

工具调用

Nova 2 Lite 通过标准 tools/tool_choice 字段支持函数调用。注意：web grounding 与代码解释器由 Bedrock 作为运行时工具托管，与你声明的函数分开。

cURL
curl https://api.therouter.ai/v1/chat/completions \
  -H "Authorization: Bearer $THEROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "amazon/nova-2-lite",
    "messages": [{"role": "user", "content": "Look up the AWS region for Tokyo."}],
    "tools": [{
      "type": "function",
      "function": {
        "name": "lookup_region",
        "parameters": {"type": "object", "properties": {"city": {"type": "string"}}}
      }
    }]
  }'

结构化 JSON 输出

使用 response_format 强制 JSON 输出，方便下游解析；可在 system prompt 中附 JSON schema 收紧结构控制。

cURL
curl https://api.therouter.ai/v1/chat/completions \
  -H "Authorization: Bearer $THEROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "amazon/nova-2-lite",
    "response_format": {"type": "json_object"},
    "messages": [
      {"role": "system", "content": "Return JSON: {\"intent\":string,\"entities\":string[]}"},
      {"role": "user", "content": "Book a flight from Tokyo to Sydney next Friday."}
    ]
  }'

视觉输入

Nova 2 Lite 原生多模态——可在 OpenAI 兼容 content 数组中同时传图像与文字。按 AWS 说明，还支持文档和短视频输入。

cURL
curl https://api.therouter.ai/v1/chat/completions \
  -H "Authorization: Bearer $THEROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "amazon/nova-2-lite",
    "messages": [{
      "role": "user",
      "content": [
        {"type": "text", "text": "Extract the invoice total and due date."},
        {"type": "image_url", "image_url": {"url": "https://example.com/invoice.png"}}
      ]
    }]
  }'

Extended thinking

默认关闭。通过 reasoning 字段开启，选择 low / medium / high 预算档位以速度换深度。AWS 建议先关，仅在确需深度推理的任务上逐级开启。

cURL
curl https://api.therouter.ai/v1/chat/completions \
  -H "Authorization: Bearer $THEROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "amazon/nova-2-lite",
    "reasoning": {"effort": "medium"},
    "messages": [{"role": "user", "content": "Plan a multi-step deployment migration."}]
  }'
事实档案 — 本页每条断言可在此回溯来源
来源URL采集于
发布时间aws.amazon.com ↗2026-05-22已核实
Bedrock 模型 idaws.amazon.com ↗2026-05-22已核实
训练数据截止——未知
Extended thinking 预算档位aws.amazon.com ↗2026-05-22已核实
内置工具aws.amazon.com ↗2026-05-22已核实
可定制化aws.amazon.com ↗2026-05-22已核实
Bedrock 档位aws.amazon.com ↗2026-05-22待核实
许可——已核实
MMLU-Promedium.com ↗2026-05-22单一来源
GPQA Diamondmedium.com ↗2026-05-22单一来源
Artificial Analysis Intelligence Indexmedium.com ↗2026-05-22单一来源
Long-context benchmarks (LongCodeBench 1M, OpenAI-MRCR)assets.amazon.science ↗2026-05-22未知
AWS 发布 Nova 2 Lite：100 万 token 上下文、extended thinking、内置 web groundingaws.amazon.com/blogs/aws ↗2026-05-22已核实
Amazon 发布 Nova 2 技术报告assets.amazon.science ↗2026-05-22已核实
Nova 2 Lite 的上下文窗口有多大？aws.amazon.com ↗2026-05-22待核实
Nova 2 Lite 支持深度推理吗？aws.amazon.com ↗2026-05-22待核实
Nova 2 Lite 内置了哪些工具？aws.amazon.com ↗2026-05-22待核实
Nova 2 Lite 可以微调吗？aws.amazon.com ↗2026-05-22待核实
Nova 2 Lite 在 Bedrock 不同档位下的价格如何？aws.amazon.com ↗2026-05-22待核实
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