GPT-5.2 - ByteSpike

Vendor: OpenAI Model ID: gpt-5-2 Capability: 128K context · tool use · vision · streaming · structured output Pricing: per-token, standard tier (live rate) GPT-5.2 was the first refinement step on the original GPT-5 — same shape, more reliable structured output. It’s still a competent production model for any team that’s already benchmark-validated against this version. For new work, prefer GPT-5.4 or GPT-5.5.

Request

curl https://llm.bytespike.ai/v1/chat/completions \
  -H "Authorization: Bearer $BYTESPIKE_API_KEY" \
  -H "content-type: application/json" \
  -d '{
    "model": "gpt-5-2",
    "messages": [{"role": "user", "content": "Summarize this earnings transcript section."}]
  }'

Body parameters

Field	Type	Required	Default	Notes
`model`	string	yes	—	`gpt-5-2`
`messages`	array	yes	—	—
`max_tokens`	integer	no	model max	Max: 16384.
`temperature`	number	no	1.0	—
`tools`	array	no	—	Function calling supported (parallel).
`response_format`	object	no	—	JSON mode + structured output.
`stream`	boolean	no	false	SSE streaming.

Response

{
  "id": "chatcmpl-…",
  "object": "chat.completion",
  "model": "gpt-5-2",
  "choices": [{"index": 0, "message": {"role": "assistant", "content": "..."}, "finish_reason": "stop"}],
  "usage": {"prompt_tokens": 1024, "completion_tokens": 218, "total_tokens": 1242}
}

Code examples

curl https://llm.bytespike.ai/v1/chat/completions \
  -H "Authorization: Bearer $BYTESPIKE_API_KEY" \
  -H "content-type: application/json" \
  -d '{"model": "gpt-5-2", "messages": [{"role": "user", "content": "..."}]}'

Streaming + caching

"stream": true for SSE. Automatic prompt caching on stable prefixes, discounted rate per pricing table.

Errors

Code	Trigger	Billed?
400 / 401 / 402 / 422 / 429	Standard	No
5xx	Upstream issue	No (auto-retry)

When to use

Existing code validated against this exact version.
For new work, prefer GPT-5.4 or GPT-5.5.
For lower cost, see GPT-5-mini.

Limits

Limit	Value
Context window	128K tokens
Max output	16384 tokens
Supports tool use	Yes (parallel)
Supports vision	Yes
Supports streaming	Yes
Supports prompt caching	Automatic

GPT-5 mini GPT-5.4 nano

​Request

​Body parameters

​Response

​Code examples

​Streaming + caching

​Errors

​When to use

​Limits