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GPT-5.6 Luna Pro

openai/gpt-5.6-luna-pro

openai

GPT-5.6 Luna with pro reasoning mode — budget tier with deeper reasoning for high-volume workloads. 1M context

Code Examples

from blockrun_llm import LLMClient

client = LLMClient()  # Uses BLOCKRUN_WALLET_KEY (never sent to server)
response = client.chat("openai/gpt-5.6-luna-pro", "Hello!")
import { LLMClient } from '@blockrun/llm';

const client = new LLMClient();  // Uses BLOCKRUN_WALLET_KEY (never sent to server)
const response = await client.chat('openai/gpt-5.6-luna-pro', 'Hello!');
curl -X POST https://blockrun.ai/api/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "PAYMENT-SIGNATURE: <payment_header>" \
  -d '{
    "model": "openai/gpt-5.6-luna-pro",
    "messages": [{"role": "user", "content": "Hello!"}],
    "max_tokens": 1024
  }'
3.36 s
median latency
6.64 s
p95 latency
100.00%
success rate
1,000+
calls, last 7 days

On BlockRun since 2026-08-03. Measured on BlockRun over the last 7 days, end to end, successful calls only. Not a vendor benchmark.

Pricing

Input$0.20 / 1M tokens
Output$1.20 / 1M tokens
Context1M tokens
Max Output128K tokens

No markup on official OpenAI rates; $0.001 fee per call.

Payment

Network
Base
Currency
USDC
Protocol
x402

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

Try It

Send a message to try GPT-5.6 Luna Pro

Connect your wallet to enable payments

About OpenAI GPT-5.6 Luna Pro

GPT-5.6 Luna Pro is a reasoning, coding and vision model from OpenAI with a 1.05M-token context window and up to 128K tokens of output per call. It is billed per token at the provider's list rate, with no markup on chat tokens. A request whose prompt reaches 272K tokens is billed entirely at the long-context tier, $0.40 in and $1.80 out per million. It is served through BlockRun's OpenAI-compatible API, so it can be called without an account, an API key, or a subscription.

What it costs

GPT-5.6 Luna Pro is billed per token. The underlying rates are $0.20 per million input tokens and $1.20 per million output tokens with no platform margin on chat tokens; only a small per-transaction fee covering on-chain settlement is added on top, and the resulting price is quoted in the 402 before you pay. You are charged for the tokens a request actually consumes — there is no monthly commitment and no unused balance to forfeit. With a context window of 1,050,000 tokens and up to 128,000 tokens of output, a single call can carry a substantial working set.

Specifications

Context window
1,050,000 tokens
Maximum output
128,000 tokens
API compatibility
OpenAI-compatible
Payment
USDC via x402
Categories
chat, reasoning, coding, vision

Calling it from your code

Pass openai/gpt-5.6-luna-pro as the model field. Because the endpoint mirrors the OpenAI chat completions schema, any existing OpenAI client works by changing the base URL — streaming, tool use, and multi-turn messages all behave the same way.

The first request returns a 402 carrying the exact price; a signed retry runs it, and client libraries fold the two into one call — how the payment works. See the documentation for request and response shapes, the LLM API page for every model on this endpoint, or browse the full catalog of 78 chat models to compare alternatives.

Related models

Every model on BlockRun is reached through the same endpoint and the same payment flow, so switching is a one-line change to the model field. These are the closest alternatives to GPT-5.6 Luna Pro:

Two ways to run this

Get an API key

Sign in, get a key, and call the same endpoints with usage billed to your account. For teams that want one invoice instead of one wallet.

Get an API key 

Or let your agent pay per call, in USDC

No account, no API key. Three steps, and the last one is the request this page is about.

  1. 01
    Point your agent at BlockRun

    Install ClawRouter, or add the BlockRun MCP server to Claude Code, Cursor, Codex or OpenClaw. Any OpenAI-compatible client works too — change the base URL, nothing else.

    curl -fsSL https://blockrun.ai/ClawRouter-update | bash
  2. 02
    Fund a wallet with USDC

    Send USDC to a wallet on Base or Solana. There is no account to create and no API key to issue: the wallet is the account, and it pays per call.

  3. 03
    Call GPT-5.6 Luna Pro

    The first call returns HTTP 402 with the exact price, your agent signs it, and the answer comes back. Payment settles on-chain; nothing is charged if the call fails.

    curl -X POST https://blockrun.ai/api/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{"model": "openai/gpt-5.6-luna-pro", "messages": [{"role": "user", "content": "Hello!"}]}'
ClawRouter setup →How paying per call works →

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