LIMITED PREVIEWGPT-5.6 FAMILYTEXT + VISIONPROMPT CACHINGTRUSTED PARTNERS
GPT-5.6 Sol API Pricing
GPT-5.6 Sol is OpenAI's highest-accuracy GPT-5.6 preview tier for hard reasoning, coding, and senior-agent workloads: $5/M input, $30/M output, and $0.50/M cached input. Prices are pulled from OpenAI's official GPT-5.6 preview post; access is limited while broad availability is pending.
Input - per 1M tokens
$5.00/M
Limited preview API/Codex partners preview
Output - per 1M tokens
$30.00/M
OpenAI-posted launch price preview
Cached input - 90% off
$0.50/M
Prompt cache read price -90%
Effective - agentic blend
$3.61/M
92/8 split - 82% cache
§ 01 / TERMINAL
Run the numbers.
Live calculator pre-loaded with GPT-5.6 Sol preview rates. Tweak spend, output mix, or cache hit rate; share the URL to share the calculation.
$ /mo
Workload split
Prompt cache hit rate
Tokens you can process
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Words equivalent (English)
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Effective rate
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§ 02 / SCENARIOS
Real-world presets.
CODING AGENT
Repo-wide architecture migration
$0.517/task
RESEARCH
Multi-step diligence brief
$0.199/brief
LONG DOC ANALYSIS
Reading 150-page contracts
$0.554/doc
ASSISTANT
Executive workflow turn
$0.018/turn
§ 03 / TOKENIZER
Paste text. See tokens. See cost.
Exact · o200k_base Auto-counts as you type
Counted with the o200k_base BPE encoding — the same tokenizer the API uses — entirely in your browser. The encoder loads on your first keystroke (~1 MB, one time); your text never leaves this page.
Characters 602
Words 91
Tokens (exact) 144 tokens
Cost as input · uncached $0.000720 USD
Cost as output · uncached $0.004320 USD
Cost as cached input $0.000072 USD
| Model | Input /M | Output /M | Effective blended | Context | Best for |
|---|---|---|---|---|---|
| GPT-5.6 Sol Current | $5.00 cache $0.50 | $30.00 | $3.61 agentic 92/8 | TBD | Highest-accuracy GPT-5.6 preview |
| GPT-5.6 Terra | $2.50 cache $0.25 | $15.00 | $1.80 same blend | TBD | Balanced GPT-5.6 preview agents |
| GPT-5.6 Luna | $1.00 cache $0.10 | $6.00 | $0.72 same blend | TBD | Cheapest GPT-5.6 preview routing |
| GPT-5.5 | $5.00 cache $0.50 | $30.00 | $3.61 same blend | 1M | Current broadly available OpenAI flagship |
| GPT-5.4 | $2.50 cache $0.25 | $15.00 | $1.80 same blend | 1.05M | Broadly available balanced OpenAI tier |
| GPT-5.4 mini | $0.75 cache $0.07 | $4.50 | $0.54 same blend | 400K | Lower-cost OpenAI subagents |
| Claude Opus 4.8 | $5.00 cache $0.50 | $25.00 | $3.21 same blend | 1M | Anthropic Opus frontier alternative |
| Gemini 3.5 Flash | $1.50 cache $0.15 | $9.00 | $1.08 same blend | 2M | Google multimodal context alternative |
Compare siblings
Frequently asked.
GPT-5.6 Sol is a limited-preview model, so the most important trust boundary is separating published prices from unpublished specs.
Q · 01 How much does GPT-5.6 Sol cost? +
OpenAI lists GPT-5.6 Sol at
$5/M input tokens, $30/M output tokens, and $0.50/M cached input tokens. These are launch-preview prices from OpenAI's GPT-5.6 announcement, verified 2026-06-28.Q · 02 Is GPT-5.6 Sol generally available? +
No. OpenAI describes GPT-5.6 access as a limited preview for trusted API and Codex partners, with broader availability planned later. Treat production access, quota, and SLAs as account-specific until OpenAI publishes a normal model-card row.
Q · 03 What is the context window? +
OpenAI has not published a context-window number for GPT-5.6 Sol in the public model docs yet. This page marks context as
TBD instead of copying the GPT-5.5 or GPT-5.4 window without a source.Q · 04 Does prompt caching apply? +
Yes, the published cached-input price is
$0.50/M, which is 90% below the fresh-input price. The calculator uses the standard AI//COST agentic assumption: 92% input tokens, 8% output tokens, and 82% cache hits.Q · 05 Are Batch, Flex, or Priority prices published? +
OpenAI's GPT-5.6 preview post publishes the headline input, output, and cached-input prices. It does not publish separate Batch, Flex, Priority, long-context, or data-residency rows for these preview tiers, so this page does not invent them.
Q · 06 Which GPT-5.6 tier should I choose? +
Use Sol for the hardest preview tasks, Terra for balanced agent workloads, and Luna for lower-cost routing or production trials. If you do not have GPT-5.6 preview access, compare against GPT-5.5, GPT-5.4, or GPT-5.4 mini instead.