Seed 1.8 (251228) API

Model details

Context window

256K tokens

Max output

—

Input

Text, images

Output

Text

Capabilities

Reasoning, Vision, Tool calling, Streaming, JSON output

Interfaces

OpenAI-style Chat Completions, Anthropic-style Messages, OpenAI-style Responses

Why teams pick it

• Seed 1.8 (251228) for OpenAI-style Chat Completions, Anthropic-style Messages, OpenAI-style Responses.

Call Seed 1.8 (251228)

Seed 1.8 (251228) answers on any of the APIs below — pick the one your code already speaks and just swap in your Inferray key.

curl https://api.inferray.com/v1/chat/completions \
  -H "Authorization: Bearer inferray_..." \
  -H "Content-Type: application/json" \
  -d '{
  "model": "seed-1-8-251228",
  "messages": [
    {
      "role": "user",
      "content": "Hello"
    }
  ]
}'

curl https://api.inferray.com/v1/messages \
  -H "Authorization: Bearer inferray_..." \
  -H "Content-Type: application/json" \
  -d '{
  "model": "seed-1-8-251228",
  "max_tokens": 1024,
  "messages": [
    {
      "role": "user",
      "content": "Hello"
    }
  ]
}'

curl https://api.inferray.com/v1/responses \
  -H "Authorization: Bearer inferray_..." \
  -H "Content-Type: application/json" \
  -d '{
  "model": "seed-1-8-251228",
  "input": "Hello"
}'

Use Seed 1.8 (251228) in your tools

Every coding agent below has a setup guide. Set the model to seed-1-8-251228.

• Claude Code
• Codex
• opencode
• Cline
• Roo Code
• Aider
• Continue

More from ByteDance

Alternatives to Seed 1.8 (251228)

• GPT-5 MiniGPT-5 Mini for OpenAI-style Chat Completions, Anthropic-style Messages, OpenAI-style Responses.OpenAI
• Qwen3.5 35B A3BQwen3.5 35B A3B for OpenAI-style Chat Completions, Anthropic-style Messages, OpenAI-style Responses.Alibaba
• Mistral Large 3Mistral Large 3 for OpenAI-style Chat Completions, Anthropic-style Messages, OpenAI-style Responses.Mistral

Questions about this model

How much does the Seed 1.8 (251228) API cost?

Seed 1.8 (251228) costs $0.25 per 1M input tokens and $2 per 1M output tokens on Inferray, and cached input is $0.05 per 1M. That is the list price, with no gateway fee on top.

Is there a free tier for Seed 1.8 (251228)?

No. You add credit and pay Seed 1.8 (251228)'s list rate for each request — seats, projects, and API keys are free, and pay-as-you-go credit never expires.

Am I charged for failed requests?

No. A request that fails without returning a result is not billed. If a response fails part-way, the tokens already processed before the failure are charged.

Is Seed 1.8 (251228) included in Token Plans?

No. Seed 1.8 (251228) is pay-as-you-go only; Token Plans cover the other text models in the catalog.

Can I use Seed 1.8 (251228) in Claude Code?

Yes. Set ANTHROPIC_BASE_URL to https://api.inferray.com, ANTHROPIC_AUTH_TOKEN to your Inferray key, and ANTHROPIC_MODEL to seed-1-8-251228. The same key works in Codex, opencode, Cline, and other agents.

Does Seed 1.8 (251228) support tool calling and vision?

Seed 1.8 (251228) supports tool calling, image input, reasoning, JSON output and streaming on Inferray.

Is it the real Seed 1.8 (251228)?

Yes. A request for seed-1-8-251228 is answered by Seed 1.8 (251228) from ByteDance, billed at its published list price. Inferray never substitutes a different or smaller model.