# OpenAI GPT-5 API

> GPT-5 is OpenAI's reasoning model released in August 2025 for coding, reasoning and agentic tasks across domains, accepting text and image input and producing text. OpenAI describes it as a coding collaborator for fixing bugs, editing code and answering questions about complex codebases, with configurable reasoning effort that includes a minimal setting for quicker replies. OpenAI now labels it a previous model, and later GPT-5.x releases are its recommended successors for fresh work.

Source: https://www.sandbase.ai/model/openai/gpt-5
API reference: https://www.sandbase.ai/model/openai/gpt-5/docs

## Facts

- Provider: OpenAI
- Type: Language model
- Model ID: `openai/gpt-5`
- Price: $1.25 per 1M input tokens, $10 per 1M output tokens
- Context window: 400K tokens, up to 128K output tokens
- Capabilities: chat, vision, reasoning, structured output, function calling
- Billing: pay per use from one SandBase balance; no provider account or subscription needed

## Call it

- Responses API: `POST https://api.sandbase.ai/v1/responses`
- Chat Completions API: `POST https://api.sandbase.ai/v1/chat/completions`

```bash
curl -X POST https://api.sandbase.ai/v1/responses \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "openai/gpt-5",
  "input": "Hello",
  "max_output_tokens": 2048
}'
```

## FAQ

### How do I call OpenAI GPT-5 through SandBase?

Create a SandBase API key, then send requests with the model ID "openai/gpt-5" to Responses API (/v1/responses) or Chat Completions API (/v1/chat/completions) at https://api.sandbase.ai. The request examples on this page show the exact payload.

### How much does OpenAI GPT-5 cost?

$1.25 per 1M input tokens and $10 per 1M output tokens, billed per request from your SandBase balance. Discounts, when available, are shown in the pricing on this page.

### What is the context window of OpenAI GPT-5?

400K tokens of context, with up to 128K output tokens per response.

### How does OpenAI GPT-5 score on benchmarks?

OpenAI GPT-5 scores 23.0 on the Artificial Analysis Intelligence Index (v4.3), ranking #55 of 83 models on SandBase; Coding Index 37.8. Source: Artificial Analysis, measured as GPT-5 (High).

### Which features does OpenAI GPT-5 support?

OpenAI GPT-5 supports vision (image input), reasoning, function calling, structured output. See Specifications above for the full list.

### Do I need a separate OpenAI account?

No. One SandBase API key and balance gives you access to OpenAI GPT-5 and the other models in the catalog; you do not need to sign up with OpenAI separately.