GPT-5.6 Sol

by OpenAI

GPT-5.6 Sol sits at the top of the GPT-5.6 family OpenAI released on July 9, 2026, the generation that split the lineup into named capability tiers with Sol as the frontier flagship. It works across a 1.05 million token context with up to 128K output tokens, and it leads the family on long-horizon agentic evaluations covering terminal work, web browsing, and computer use. Sol is the tier for the hardest problems, complex software engineering, deep research, security analysis, and agent runs that stretch over many steps and hours. Reasoning, vision, tool calling, and structured output are all native, and its near-flagship long-context recall makes it dependable when entire codebases or document collections need to stay in play.

Key info

Input
Output
Features
Context window
1.1M
Max output
128K
Input price
$5.00 /1M
Output price
$30.00 /1M
  • US residency available
  • Zero data retention on pay-as-you-go
  • No training by default
  • GDPR DPA available

Available routes

GPT-5.6 Sol runs on 2 different routes through the Opper gateway. Compare residency, ZDR, and training posture at a glance β€” full data-handling detail per route below.

ProviderRegionZero data retentionTrainingInputOutput
MultiZero data retentionNo$5.00$30.00
USEnterpriseNo$5.00$30.00

Uptime and availability

GPT-5.6 Sol runs on 2 independently monitored routes through the Opper gateway. A direct integration leaves you on one of them, the gateway serves whichever is healthy.

100%effective uptime, last 30 days
Averaged across these routes on their own, a single provider reached 98.59% over the same window.
Daily status through the gateway, which serves each request from whichever route is healthy.
2 monitored providers serve GPT-5.6 Sol.

Measured over the last 30 days from each provider's official status feed via StatusGator. Refreshed hourly. See uptime for every provider Opper monitors.

Data handling per route

Each route hosting GPT-5.6 Sol has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.

AWS Bedrock β€” United StatesπŸ‡ΊπŸ‡Έ

Zero data retention is on by default on Pay-as-you-go β€” no action required. No training on customer data. GLOBAL; SCCs; DPA available.

Zero data retention
On by default on Pay-as-you-go.
Training
No training on customer data.
Logging
None
Third-party access
None disclosed
GDPR DPA
DPA available
Transfer mechanism
SCCs

OpenAI β€” United StatesπŸ‡ΊπŸ‡Έ

Zero data retention is available via Opper Enterprise contract. No training on customer data. US; SCCs; DPA available.

Zero data retention
Available via Opper Enterprise contract.
Training
No training on customer data.
Logging
Abuse monitoring (30-day retention)
Third-party access
None disclosed
GDPR DPA
DPA available
Transfer mechanism
SCCs

Benchmarks

Independent benchmark scores β€” composite indices for reasoning, coding, and math, plus individual eval scores where available.

Global rank#5 of 597 LLMs
TierFrontier
Output speed69 tok/s
First token75.25s
Intelligence Index60.9
Coding Index77.4
Reasoning & knowledge
GPQA Diamond
94%
Humanity's Last Exam
50%
Long-context reasoning
78%
Coding
SciCode
56%
Agentic & tool use
Terminal-Bench Hard
66%
τ²-Bench Telecom
85%
Math & instruction following
IFBench
73%

Get started

Call GPT-5.6 Sol through the Opper gateway with one API key. Let your coding agent set it up, or call it directly β€” Opper is drop-in compatible with the OpenAI, Anthropic, and Google AI SDKs.

Set it up with your agent

Copy this and paste it into a coding agent like Claude Code, Cursor or Codex and it'll wire up Opper for you.

Or call it directly

import OpenAI from "openai";
const client = new OpenAI({
apiKey: process.env.OPPER_API_KEY,
baseURL: "https://api.opper.ai/v3/compat",
});
const completion = await client.chat.completions.create({
model: "openai/gpt-5.6-sol",
messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);

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Side-by-side on privacy, EU hosting, pricing, and benchmarks.

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