> Discover all available pages from the documentation index: https://mastra.ai/llms.txt # ![Helicone logo](https://models.dev/logos/helicone.svg)Helicone Access 90 Helicone models through Mastra's model router. Authentication is handled automatically using the `HELICONE_API_KEY` environment variable. Learn more in the [Helicone documentation](https://helicone.ai/models). ```bash HELICONE_API_KEY=your-api-key ``` ```typescript import { Agent } from "@mastra/core/agent"; const agent = new Agent({ id: "my-agent", name: "My Agent", instructions: "You are a helpful assistant", model: "helicone/chatgpt-4o-latest" }); // Generate a response const response = await agent.generate("Hello!"); // Stream a response const stream = await agent.stream("Tell me a story"); for await (const chunk of stream) { console.log(chunk); } ``` > **Note:** Mastra uses the OpenAI-compatible `/chat/completions` endpoint. Some provider-specific features may not be available. Check the [Helicone documentation](https://helicone.ai/models) for details. ## Models | Model | Context | Tools | Reasoning | Image | Audio | Video | Input $/1M | Output $/1M | | ---------------------------------------- | ------- | ----- | --------- | ----- | ----- | ----- | ---------- | ----------- | | `helicone/chatgpt-4o-latest` | 128K | | | | | | $5 | $20 | | `helicone/claude-3-haiku-20240307` | 200K | | | | | | $0.25 | $1 | | `helicone/claude-3.5-haiku` | 200K | | | | | | $0.80 | $4 | | `helicone/claude-3.5-sonnet-v2` | 200K | | | | | | $3 | $15 | | `helicone/claude-3.7-sonnet` | 200K | | | | | | $3 | $15 | | `helicone/claude-4.5-haiku` | 200K | | | | | | $1 | $5 | | `helicone/claude-4.5-opus` | 200K | | | | | | $5 | $25 | | `helicone/claude-4.5-sonnet` | 200K | | | | | | $3 | $15 | | `helicone/claude-haiku-4-5-20251001` | 200K | | | | | | $1 | $5 | | `helicone/claude-opus-4` | 200K | | | | | | $15 | $75 | | `helicone/claude-opus-4-1` | 200K | | | | | | $15 | $75 | | `helicone/claude-opus-4-1-20250805` | 200K | | | | | | $15 | $75 | | `helicone/claude-sonnet-4` | 200K | | | | | | $3 | $15 | | `helicone/claude-sonnet-4-5-20250929` | 200K | | | | | | $3 | $15 | | `helicone/deepseek-r1-distill-llama-70b` | 128K | | | | | | $0.03 | $0.13 | | `helicone/deepseek-reasoner` | 128K | | | | | | $0.56 | $2 | | `helicone/deepseek-tng-r1t2-chimera` | 130K | | | | | | $0.30 | $1 | | `helicone/deepseek-v3` | 128K | | | | | | $0.56 | $2 | | `helicone/deepseek-v3.1-terminus` | 128K | | | | | | $0.27 | $1 | | `helicone/deepseek-v3.2` | 164K | | | | | | $0.27 | $0.41 | | `helicone/ernie-4.5-21b-a3b-thinking` | 128K | | | | | | $0.07 | $0.28 | | `helicone/gemini-2.5-flash` | 1.0M | | | | | | $0.30 | $3 | | `helicone/gemini-2.5-flash-lite` | 1.0M | | | | | | $0.10 | $0.40 | | `helicone/gemini-2.5-pro` | 1.0M | | | | | | $1 | $10 | | `helicone/gemini-3-pro-preview` | 1.0M | | | | | | $2 | $12 | | `helicone/gemma-3-12b-it` | 131K | | | | | | $0.05 | $0.10 | | `helicone/gemma2-9b-it` | 8K | | | | | | $0.01 | $0.03 | | `helicone/glm-4.6` | 205K | | | | | | $0.45 | $2 | | `helicone/gpt-4.1` | 1.0M | | | | | | $2 | $8 | | `helicone/gpt-4.1-mini` | 1.0M | | | | | | $0.40 | $2 | | `helicone/gpt-4.1-mini-2025-04-14` | 1.0M | | | | | | $0.40 | $2 | | `helicone/gpt-4.1-nano` | 1.0M | | | | | | $0.10 | $0.40 | | `helicone/gpt-4o` | 128K | | | | | | $3 | $10 | | `helicone/gpt-4o-mini` | 128K | | | | | | $0.15 | $0.60 | | `helicone/gpt-5` | 400K | | | | | | $1 | $10 | | `helicone/gpt-5-chat-latest` | 128K | | | | | | $1 | $10 | | `helicone/gpt-5-codex` | 400K | | | | | | $1 | $10 | | `helicone/gpt-5-mini` | 400K | | | | | | $0.25 | $2 | | `helicone/gpt-5-nano` | 400K | | | | | | $0.05 | $0.40 | | `helicone/gpt-5-pro` | 128K | | | | | | $15 | $120 | | `helicone/gpt-5.1` | 400K | | | | | | $1 | $10 | | `helicone/gpt-5.1-chat-latest` | 128K | | | | | | $1 | $10 | | `helicone/gpt-5.1-codex` | 400K | | | | | | $1 | $10 | | `helicone/gpt-5.1-codex-mini` | 400K | | | | | | $0.25 | $2 | | `helicone/gpt-oss-120b` | 131K | | | | | | $0.04 | $0.16 | | `helicone/gpt-oss-20b` | 131K | | | | | | $0.05 | $0.20 | | `helicone/grok-3` | 131K | | | | | | $3 | $15 | | `helicone/grok-3-mini` | 131K | | | | | | $0.30 | $0.50 | | `helicone/grok-4` | 256K | | | | | | $3 | $15 | | `helicone/grok-4-1-fast-non-reasoning` | 2.0M | | | | | | $0.20 | $0.50 | | `helicone/grok-4-1-fast-reasoning` | 2.0M | | | | | | $0.20 | $0.50 | | `helicone/grok-4-fast-non-reasoning` | 2.0M | | | | | | $0.20 | $0.50 | | `helicone/grok-4-fast-reasoning` | 2.0M | | | | | | $0.20 | $0.50 | | `helicone/grok-code-fast-1` | 256K | | | | | | $0.20 | $2 | | `helicone/hermes-2-pro-llama-3-8b` | 131K | | | | | | $0.14 | $0.14 | | `helicone/kimi-k2-0711` | 131K | | | | | | $0.57 | $2 | | `helicone/kimi-k2-0905` | 262K | | | | | | $0.50 | $2 | | `helicone/kimi-k2-thinking` | 256K | | | | | | $0.48 | $2 | | `helicone/llama-3.1-8b-instant` | 131K | | | | | | $0.05 | $0.08 | | `helicone/llama-3.1-8b-instruct` | 16K | | | | | | $0.02 | $0.05 | | `helicone/llama-3.1-8b-instruct-turbo` | 128K | | | | | | $0.02 | $0.03 | | `helicone/llama-3.3-70b-instruct` | 128K | | | | | | $0.13 | $0.39 | | `helicone/llama-3.3-70b-versatile` | 131K | | | | | | $0.59 | $0.79 | | `helicone/llama-4-maverick` | 131K | | | | | | $0.15 | $0.60 | | `helicone/llama-4-scout` | 131K | | | | | | $0.08 | $0.30 | | `helicone/llama-guard-4` | 131K | | | | | | $0.21 | $0.21 | | `helicone/llama-prompt-guard-2-22m` | 512 | | | | | | $0.01 | $0.01 | | `helicone/llama-prompt-guard-2-86m` | 512 | | | | | | $0.01 | $0.01 | | `helicone/mistral-large-2411` | 128K | | | | | | $2 | $6 | | `helicone/mistral-nemo` | 128K | | | | | | $20 | $40 | | `helicone/mistral-small` | 128K | | | | | | $0.07 | $0.20 | | `helicone/o1` | 200K | | | | | | $15 | $60 | | `helicone/o1-mini` | 128K | | | | | | $1 | $4 | | `helicone/o3` | 200K | | | | | | $2 | $8 | | `helicone/o3-mini` | 200K | | | | | | $1 | $4 | | `helicone/o3-pro` | 200K | | | | | | $20 | $80 | | `helicone/o4-mini` | 200K | | | | | | $1 | $4 | | `helicone/qwen2.5-coder-7b-fast` | 32K | | | | | | $0.03 | $0.09 | | `helicone/qwen3-235b-a22b-thinking` | 262K | | | | | | $0.30 | $3 | | `helicone/qwen3-30b-a3b` | 41K | | | | | | $0.08 | $0.29 | | `helicone/qwen3-32b` | 131K | | | | | | $0.29 | $0.59 | | `helicone/qwen3-coder` | 262K | | | | | | $0.22 | $0.95 | | `helicone/qwen3-coder-30b-a3b-instruct` | 262K | | | | | | $0.10 | $0.30 | | `helicone/qwen3-next-80b-a3b-instruct` | 262K | | | | | | $0.14 | $1 | | `helicone/qwen3-vl-235b-a22b-instruct` | 256K | | | | | | $0.30 | $2 | | `helicone/sonar` | 127K | | | | | | $1 | $1 | | `helicone/sonar-deep-research` | 127K | | | | | | $2 | $8 | | `helicone/sonar-pro` | 200K | | | | | | $3 | $15 | | `helicone/sonar-reasoning` | 127K | | | | | | $1 | $5 | | `helicone/sonar-reasoning-pro` | 127K | | | | | | $2 | $8 | ## Advanced configuration ### Custom headers ```typescript const agent = new Agent({ id: "custom-agent", name: "custom-agent", model: { url: "https://ai-gateway.helicone.ai/v1", id: "helicone/chatgpt-4o-latest", apiKey: process.env.HELICONE_API_KEY, headers: { "X-Custom-Header": "value" } } }); ``` ### Dynamic model selection ```typescript const agent = new Agent({ id: "dynamic-agent", name: "Dynamic Agent", model: ({ requestContext }) => { const useAdvanced = requestContext.task === "complex"; return useAdvanced ? "helicone/sonar-reasoning-pro" : "helicone/chatgpt-4o-latest"; } }); ```