Price check $0.020–$30.00 per million tokens 15 published rates · pay as you go

GPT-5.6 (Sol, Terra & Luna) Usage Pricing

Model Input Output Cached Per
gpt-5.6-luna $0.200 $1.20 $0.020 1M tokens
gpt-5.6-luna (long context) $0.400 $1.80 — 1M tokens
  • OpenAI reduced GPT-5.6 API pricing on July 30, 2026; rates here reflect the post-reduction schedule
  • Cache writes billed at 1.25x the model's uncached input rate
  • Batch API offers 50% off standard rates for async workloads
Model Input Output Cached Per
gpt-5.6-terra $2.00 $12.00 $0.200 1M tokens
gpt-5.6-terra (long context) $4.00 $18.00 — 1M tokens
  • OpenAI reduced GPT-5.6 API pricing on July 30, 2026; rates here reflect the post-reduction schedule
  • Cache writes billed at 1.25x the model's uncached input rate
  • Batch API offers 50% off standard rates for async workloads
Model Input Output Cached Per
gpt-5.6-sol $4.00 $20.00 $0.400 1M tokens
gpt-5.6-sol (long context) $8.00 $30.00 — 1M tokens
  • OpenAI reduced GPT-5.6 API pricing on July 30, 2026; rates here reflect the post-reduction schedule
  • Cache writes billed at 1.25x the model's uncached input rate
  • Batch API offers 50% off standard rates for async workloads
  • ChatGPT Plus, Pro, Business, and Enterprise users access Sol, Terra, and Luna with selectable effort levels
  • Sol promotional pricing is available at least through November 21, 2026
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Quick Answer
Last verified:
Medium confidence

GPT-5.6 (Sol, Terra & Luna) uses usage-based pricing from $0.200 to $30.00 per million tokens as of September 2026. Usage cost depends on the selected model and generation volume.

  • 12 documented hidden costs beyond list price
  • Contracts auto-renew — 30-day
Last verified: | Sources: 3 pricing pages and reviews

How much does GPT-5.6 (Sol, Terra & Luna) cost?

GPT-5.6 (Sol, Terra & Luna) uses usage-based pricing from $0.020–$30.00 per million tokens. The published rate card contains 15 per-generation prices; there is no monthly subscription price for this API tier.

GPT-5.6 (Sol, Terra & Luna) Pricing Overview

GPT-5.6 (Sol, Terra & Luna) uses usage-based pricing from $0.020–$30.00 per million tokens across 15 published rates.

GPT-5.6 (Sol, Terra & Luna) contracts auto-renew, requiring 30-day notice to cancel, and annual price increases of 5% to 8%.

There are at least 12 documented hidden costs beyond GPT-5.6 (Sol, Terra & Luna)'s list price, including implementation, training, and add-on fees.

This pricing was last verified in August 23, 2026 from 3 independent sources.

View GPT-5.6 (Sol, Terra & Luna) API Pricing

GPT-5.6 costs from $0.20 per million input tokens (Luna) to $30.00 per million output tokens (Sol long context), following OpenAI's July 30, 2026 price reduction. OpenAI's GPT-5.6 family launched July 9, 2026 with three models, repriced downward on July 30: Sol (flagship, $4/$20 per M tokens at short context), Terra (balanced, $2/$12), and Luna (economy, $0.20/$1.20). Long-context requests bill at double those rates. Cached input tokens cost 90% less than standard input across all three, and the Batch API cuts rates in half for asynchronous workloads. ChatGPT Plus, Pro, Business, and Enterprise users can select among all three models with adjustable effort levels; Pro and Enterprise users also get access to Sol Pro.

How GPT-5.6 (Sol, Terra & Luna) Pricing Compares

Compare GPT-5.6 (Sol, Terra & Luna) pricing against top alternatives in LLM API Providers.

Amazon Bedrock $0.07-$75 per million tokens View pricing → Anyscale $0.15-$5 per million tokens View pricing → Baidu ERNIE API $0.1-$10 per million tokens View pricing →

Compare GPT-5.6 (Sol, Terra & Luna) vs Alternatives

Before committing to GPT-5.6 (Sol, Terra & Luna), compare pricing with these 3 alternatives in the same category.

VSAmazon Bedrock
From $0.07 per million tokens

AWS-native deployments needing multi-model routing

Compare pricing
VSAnyscale
From $0.15 per million tokens

Teams needing scalable open-source LLM inference with Ray reliability

Compare pricing
VSBaidu ERNIE API
From $0.1 per million tokens

China-market apps and Chinese-first workloads

Compare pricing

All GPT-5.6 (Sol, Terra & Luna) alternatives & migration guides

What Buyers Report Paying for GPT-5.6 (Sol, Terra & Luna)

Buyer-reported pricing
from $20/user/monthestimated range, 4 public sources

GPT-5.6 (Sol, Terra & Luna) is reported at around $20 per user per month, based on 4 public sources. This is an estimate, not an official quote. Pricing is driven by per-user monthly subscriptions for ChatGPT access or usage-based API token consumption.

What Companies Actually Pay for GPT-5.6 (Sol, Terra & Luna)

Review scores
Trustpilot 1.5out of 5 (3,000)
Third-party review aggregates, as of Aug 2026
Top pricing complaints
Overstepping and Overeagerness: GPT-5.6 has a documented tendency to "overstep" and can be "overeager".Disappointing Experiences: Some users have reported extremely disappointing experiences with GPT-5.6 Sol and very bad first experiences with GPT-5.6 Terra.Smart but Slow and Expensive (Luna): While GPT-5.6 Luna is considered smart, it can be slow, often going in circles and taking multiple iterations to solve problems that other models might handle in one shot. It is also noted as being much more expensive for light personal assistant use.Poor Direction Following (Luna): Luna has been reported to struggle with following directions, ignoring memory and "soul directives," and sometimes "forgetting" or completely ignoring parts of a task.

How GPT-5.6 (Sol, Terra & Luna) Pricing Compares

Software Starting Price Top Price
GPT-5.6 (Sol, Terra & Luna) $0.200 $30.00 per million tokens
Amazon Bedrock $0.07 per million tokens $75 per million tokens
Anyscale Free $4.9591 per million tokens
Baidu ERNIE API $0.1 per million tokens $10 per million tokens
Cerebras Inference API $0.1 per million tokens $6 per million tokens
Cohere API Free $15 per million tokens

Browse all LLM API Providers pricing →

12 GPT-5.6 (Sol, Terra & Luna) Hidden Costs Beyond the List Price

Beyond the listed price, GPT-5.6 (Sol, Terra & Luna) has at least 12 documented hidden costs that can significantly increase total cost of ownership.

Watch for 12 hidden costs
  • Developer Resources
    medium 1 source
    industry "It excels in high-stakes tasks where accuracy is paramount"
  • Data Preparation
    medium 1 source
    industry "It excels in high-stakes tasks where accuracy is paramount"
  • Infrastructure
    medium 1 source
    industry "It excels in high-stakes tasks where accuracy is paramount"
  • Monitoring and Logging
    medium 1 source
    industry "It excels in high-stakes tasks where accuracy is paramount"
  • Potential Hidden/Implementation Costs
    medium 1 source
    industry "API Pricing for GPT-5.6 Models: The pricing for the GPT-5.6 models is based on per-million token usage for both input and output: * GPT-5."
  • Conversation History Reprocessing $5,000
    high 1 source
    industry "A 50-turn session can send 50 times more input tokens than the first turn, as the entire conversation history is re-sent with each request."
  • System Prompt Overhead $400
    medium 1 source
    industry "OpenAI officially released GPT-5.6, featuring the Sol, Terra, and Luna model tiers, on July 9, 2026, with a limited preview starting June 26, 2026."
  • Uncapped Output Generation
    high 1 source
    industry "Uncapped Output Generation: Models can produce variable-length responses, potentially generating 10 to 25 times more output tokens than projected if max_tokens limits are not explicitly set."
  • Retry and Fallback Token Waste
    low 1 source
    industry "Retry and Fallback Token Waste: Failed API requests still consume tokens on the initial attempt, adding to costs."
  • Model Misuse
    low 1 source
    industry "Model Misuse: Using LLMs for simple tasks like JSON parsing or text deduplication, which could be handled by cheaper methods like regex, wastes compute and API calls."
  • Infrastructure for Open-Source Models exceeding $12 million
    critical 1 source
    industry "Minimal internal deployments can range from $125,000 to $190,000 annually, with enterprise-scale implementations exceeding $12 million."
  • Latency Requirements
    medium 1 source
    industry "Latency Requirements: Real-time applications requiring lower latency may incur higher costs due to the need for faster (and more expensive) inference endpoints."
Tip

Ask your GPT-5.6 (Sol, Terra & Luna) sales rep about these costs upfront. Getting them in writing before signing can save you from surprise charges later.

Full hidden costs breakdown →

Intelligence sourced from 2 independent sources
industry Trustpilot Consumer reviews
Key claims include inline source attribution. Data verified against multiple independent sources. 13 source citations total.

GPT-5.6 (Sol, Terra & Luna) Contract Terms

GPT-5.6 (Sol, Terra & Luna) contracts auto-renew. Changes require 30-day. These terms are sourced from verified buyer experiences.

Contract Terms
Auto-Renewal Yes
Cancellation Notice 30-day
Price Escalation 5% to 8%
Based on 1 verified source

GPT-5.6 (Sol, Terra & Luna) Pricing FAQ

01 How much does GPT-5.6 cost per million tokens?

GPT-5.6 spans three models: Luna at $0.20 input / $1.20 output, Terra at $2.00 input / $12.00 output, and Sol at $4.00 input / $20.00 output, all per million tokens at short context. Long-context requests cost double those rates. Cached input tokens cost 90% less than standard input, and the Batch API is 50% off standard rates. OpenAI reduced GPT-5.6 API pricing on July 30, 2026.

02 When did GPT-5.6 launch?

GPT-5.6 reached general availability on July 9, 2026, with pricing unchanged from its June 25, 2026 preview.

03 Who can access GPT-5.6 Sol?

ChatGPT Plus, Pro, Business, and Enterprise users can access GPT-5.6 Sol, Terra, and Luna with selectable effort levels. Pro and Enterprise users additionally get GPT-5.6 Sol Pro for the highest-quality results on complex tasks.

04 Does GPT-5.6 offer a Batch API discount?

Yes — OpenAI's Batch API processes GPT-5.6 requests asynchronously at 50% off standard per-token rates across all three models (Sol, Terra, Luna).

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