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GPT-5.3 Codex

openai/gpt-5.3-codex

openai

Industry-leading agentic coding model. 400K context, reasoning, tool use, and complex execution

Code Examples

from blockrun_llm import LLMClient

client = LLMClient()  # Uses BLOCKRUN_WALLET_KEY (never sent to server)
response = client.chat("openai/gpt-5.3-codex", "Hello!")

Pricing

Input$1.75 / 1M tokens
Output$14.00 / 1M tokens
Context400K tokens
Max Output128K tokens

5% markup on official openai API prices.

Payment

Network
Circle Gateway (mainnet)
Currency
USDC
Protocol
x402

Pay per request with USDC on Base. No subscription required.

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