GPT-5.6 Terra Pro vs GPT-5 Nano
Pick up to 3 models · pricing, context and capabilities · simulate your product cost
Data updated on September 30, 2026· 217 models
GPT-5.6 Terra Pro is the same underlying model as GPT-5.6 Terra, served with reasoning.mode set to pro for higher-quality responses on complex tasks.
- Reasoning estimated
- ▲
- Speed estimated
- Input
- Output
- Context
- ▲1.1 M tokens
- Max output
- 128 K
- Input, $ per 1M tokens
- $2.00
- Output, $ per 1M tokens
- $12.00
- Cache read, $ per 1M
- $0.200
- Batch (input / output)
- $1.00 / $6.00
- Tool calling
- Yes
- Released
- ▲07/09/2026
- Knowledge cutoff
- 2026-02-16
- API id
- openai/gpt-5.6-terra-pro
GPT-5-Nano is the smallest and fastest variant in the GPT-5 system, optimized for developer tools, rapid interactions, and ultra-low latency environments.
- Reasoning estimated
- Speed estimated
- ▲
- Input
- Output
- Context
- 400 K tokens
- Max output
- 128 K
- Input, $ per 1M tokens
- ▲$0.050
- Output, $ per 1M tokens
- ▲$0.400
- Cache read, $ per 1M
- $0.005
- Batch (input / output)
- $0.025 / $0.200
- Tool calling
- Yes
- Released
- 08/07/2025
- Knowledge cutoff
- 2024-05-30
- API id
- openai/gpt-5-nano
Which is the better API choice: GPT-5.6 Terra Pro vs GPT-5 Nano?
- GPT-5 Nano: cheapest input (98% less than GPT-5.6 Terra Pro)
- GPT-5 Nano: cheapest output
- GPT-5.6 Terra Pro: largest context (1.1 M)
- GPT-5.6 Terra Pro: the newest (07/09/2026)
- GPT-5.6 Terra Pro: most reasoning (estimated)
- GPT-5 Nano: the fastest (estimated)
GPT-5 Nano costs 98% less on input and 97% less on output than GPT-5.6 Terra Pro ($0.050 / $0.400 versus $2.00 / $12.00 per million tokens). GPT-5.6 Terra Pro accepts more context (1.1 M). GPT-5.6 Terra Pro and GPT-5 Nano offer a batch tier at half price for jobs that do not need an immediate answer.
What would your product cost?
Estimate the monthly cost with your app's real volume. List prices, no cache or batch discounts.
With GPT-5 Nano you save $75.65 a month versus GPT-5.6 Terra Pro (97% less).
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- 4DeepSeek V4 Flash 0731 DeepSeek$1.55
- 5Ministral 3 3B 2512 Mistral$1.90
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Paste your prompt: tokens and cost per model
Rough estimate (about 4 characters per token). Nothing is sent to any server.
Cost of sending it 1,000 times (input only)
- 1GPT-5 Nano OpenAI$0.004
- 2GPT-5.6 Terra Pro OpenAI$0.152
- 3Claude Sonnet 5.5 Anthropic$0.152
- 4Claude Sonnet 5 Anthropic$0.152
- 5Claude Opus 5.5 Anthropic$0.304
- 6Claude Opus 5 Anthropic$0.380
- 7Claude Fable 5.1 Anthropic$0.760
- 8Claude Fable 5 Anthropic$0.760
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Frequently asked questions
Which is the better API choice: GPT-5.6 Terra Pro vs GPT-5 Nano?
GPT-5 Nano costs 98% less on input and 97% less on output than GPT-5.6 Terra Pro ($0.050 / $0.400 versus $2.00 / $12.00 per million tokens). GPT-5.6 Terra Pro accepts more context (1.1 M). GPT-5.6 Terra Pro and GPT-5 Nano offer a batch tier at half price for jobs that do not need an immediate answer.
Which is cheaper: GPT-5.6 Terra Pro and GPT-5 Nano?
GPT-5 Nano is cheaper: $0.050 per million input tokens and $0.400 per million output tokens, versus $2.00 / $12.00 for GPT-5.6 Terra Pro.
Which has more context: GPT-5.6 Terra Pro and GPT-5 Nano?
GPT-5.6 Terra Pro accepts 1.1 M tokens of context; GPT-5 Nano accepts 400 K.
Which is newer: GPT-5.6 Terra Pro and GPT-5 Nano?
GPT-5.6 Terra Pro was released on 07/09/2026; GPT-5 Nano on 08/07/2025.
What would 10,000 requests a month cost with GPT-5.6 Terra Pro and GPT-5 Nano?
With 1,500 input and 400 output tokens per request: GPT-5.6 Terra Pro: $78.00; GPT-5 Nano: $2.35 a month, at list price.
Where do the prices come from and how often are they updated?
From the public catalogs of OpenRouter, models.dev and LiteLLM, which publish each provider's list prices. They sync once a day and the last update date is shown above the comparison.
What does price per million tokens mean?
It is what the provider charges per million tokens you send (input) or the model generates (output). A token is roughly 4 characters. Output almost always costs more than input.
Sources: OpenRouter, models.dev and LiteLLM. Prices in USD per million tokens, list price, no volume discounts. Prompt tokens are an estimate; each provider's tokenizer may differ.