GPT-5.3 Chat (latest)

openai· 2026-03-03· 128K ctx

API onlytool callstructured quant: unknown

spread (output)

1.0×

$14.00 – $14.00 · 6 providers

6 providers priced

Provider	Input	Output	Cache rd	Blended
302.AI relay router	$1.75	$14.00	—	$2.86^*
Abacus relay router	$1.75	$14.00	—	$2.86^*
Merge Gateway unknown	$1.75	$14.00	$0.175	$1.86
OpenAI first party lab	$1.75	$14.00	$0.175	$1.86
Opper relay router	$1.75	$14.00	$0.175	$1.86
ZenMux relay router	$1.75	$14.00	—	$2.86^*

Cheapest (output)

302.AI

$14.00 /M

opencode.json

{
  "provider": {
    "302ai": {
      "npm": "@ai-sdk/openai-compatible",
      "options": {
        "baseURL": "https://api.302.ai/v1"
      },
      "models": {
        "gpt-5.3-chat-latest": {}
      }
    }
  }
}

Set 302AI_API_KEY in your environment. Generated — verify against the OpenCode docs.

Output $/M over time7-day preview

Median line, min–max band. Pre-2026-09 points are catalog-recorded dates from models.dev git history, not provider effective dates.

Full price history & dynamics

This is a 7-day preview. Sign in for 30 days free; the full series and export are the API subscription.

Data: models.dev (MIT), snapshot 2026-09-20. Prices are vendor-published; verify before purchase. Methodology.