Kyma APIKyma API
OpenAI

OpenAI

GPT-5.6 Terra

GPT-5.6 Terra is OpenAI’s balanced tier, positioned between the high-capability Sol and the budget-focused Luna. It targets developers who need reliable reasoning, tool use, and vision support for everyday coding and agentic workflows without flagship pricing.

Modalities

Text+Image → Text

Below release

Not established

Weights

Not published

Where it sits in the catalogue Kyma measures

Every number against every text model Kyma prices per token — a stated rule, not a chosen line-up.

Price · input#54/69

$2.70

output $16.20 · cached $0.27

median $1.009 · best $0.0494

Price · output#59/69

$16.20

per 1M tokens generated

median $3.528 · best $0.2164

Availability · 30d#46/67

91.82%

379 observations since 2026-07-29

median 93.5% · best 100.0%

Throughput#40/67

37.1 tok/s

probe median, one fixed prompt

median 39.4 tok/s · best 322.4 tok/s

Response time#12/67

1.24 s

probe median, to a complete answer

median 2.54 s · best 0.85 s

Context

1.05M

max output 8,192

published by OpenAI, not measured here

Tick above each rail is this model, below it the other 68. Dashed rule is the field median, solid is its best. Better is left; the axis stops at the 90th percentile, so a few models sit past its right edge.

Usage

How much this model is actually called here.

Rank

#43

of 98 active models

Tokens served

784.2K

all-time

Platform share

0.0%

of all tokens

Tokens · last 15 daysAug 31 → Sep 14

Pricing

Pay per token. Cached input bills at this model’s own cached rate, listed below.

$2.70 /1M input$16.20 /1M output
Hobby10 req/day · 2K in / 500 out
~$4.05/mo
Production1,000 req/day · 2K in / 500 out
~$405/mo
Scale20,000 req/day · 2K in / 500 out
~$8,100/mo
+ Estimate your workload
1,000
2,000
500
30%

Estimated monthly cost

$361

$12.04 / day on GPT-5.6 Terra

Same workload on:

GPT-5.6 Sol Pro$365≈
GPT-5.6 Sol$365≈

Estimates use list pricing with cached input at this model's own cached rate. Actual bills depend on real token counts, and every response includes its exact cost.

When to use GPT-5.6 Terra

Updated 2026-07-29

Where this model earns its cost — and where it doesn't.

This frontier-class model accepts text and image inputs and returns text. It supports tool calling, extended reasoning, structured outputs, and prompt caching. With a 1,050,000-token context window and an 8,192-token maximum output, it handles long documents and multi-step tasks.

On Kyma, the model runs through an OpenAI-compatible endpoint using a single API key. Requests benefit from automatic failover, and the response headers include the exact model that executed the prompt via X-Kyma-Model. Usage costs are returned in the usage.cost field, and repeated prompt prefixes are billed at this model's cached input rate when caching is active.

The model operates at a medium speed tier and a premium cost tier. It does not support audio or video inputs, and the maximum output length is capped at 8,192 tokens, which restricts very long-form generation tasks.

Everyday Code Generation

Handles routine scripting, refactoring, and debugging tasks with reliable tool integration.

Multi-Step Agent Workflows

Executes chained function calls and maintains state across complex operational loops.

Technical Document Analysis

Processes long text and image inputs within a million-token context window.

Interactive Chat Applications

Delivers consistent conversational responses with structured output formatting.

Not ideal for: It is not suited for high-throughput batch processing or tasks requiring ultra-low latency, as it operates at a medium speed tier and premium cost tier.

How it compares

Against the peers people actually weigh it against.

SpecGPT-5.6 TerraGPT-5.6 Sol ProGPT-5.6 Sol
Input /1M$2.70$2.70$2.70
Output /1M$16.20$13.50$13.50
Context1M1M1M
ToolsYesYesYes
ReasoningYesYesYes
Throughput37.1 tok/s54.7 tok/s28.8 tok/s

Quick start

Up and running in under two minutes.

  1. 1

    Create an API key

    Sign up and grab a key from the dashboard. GPT-5.6 Terra needs a top-up — the signup credit covers the free tier.

    Get API key →
  2. 2

    Make your first request

    Drop in your key and send a chat completion — fully OpenAI-compatible.

    curl https://kymaapi.com/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.6-terra",
    "messages": [
      {"role": "user", "content": "Explain prompt caching in one paragraph."}
    ]
  }'
  3. 3

    Stream responses

    Add "stream": true to receive tokens as they arrive.

    curl https://kymaapi.com/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.6-terra",
    "stream": true,
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

FAQ

Common questions about this model.

What is the context window of GPT-5.6 Terra?

GPT-5.6 Terra has a 1M-token context window — roughly 1544 pages of text in a single request.

How much does the GPT-5.6 Terra API cost?

$2.70 per 1M input tokens and $16.20 per 1M output tokens, with cached input at $0.27/1M — 90% off the input rate on repeated prompt prefixes. No subscription; you pay only for what you use.

Does GPT-5.6 Terra support function calling?

Yes — GPT-5.6 Terra supports tool/function calling and structured outputs (JSON mode), so it works with agent frameworks out of the box.

Are the weights for GPT-5.6 Terra publicly available?

No. OpenAI does not publish GPT-5.6 Terra's weights — it is reachable through an API rather than as a file you can download and run (https://developers.openai.com/api/docs/models/gpt-5.6-terra, read 2026-08-14). That is OpenAI's decision about their own product, not a limitation of Kyma.

Is GPT-5.6 Terra ever served below the precision its creator released it at?

Kyma cannot say, and for this model nobody can. OpenAI does not publish GPT-5.6 Terra's weights, so there is no released checkpoint whose precision a route could be measured against. We publish "not established" rather than reading a low format as a downgrade: on several models in this catalogue a low format is exactly how the creator ships it.

How do I use GPT-5.6 Terra?

Kyma is OpenAI-compatible: point your SDK's base URL at https://kymaapi.com/v1, use your Kyma API key, and set the model to gpt-5.6-terra. Signing up is free, but this model needs a top-up: the $0.50 signup credit covers the free tier only.

Does this model support image inputs?

Yes, it accepts both text and image inputs and returns text-only outputs.

How does prompt caching work on Kyma?

When enabled, repeated prompt prefixes are billed at this model's cached input rate, reducing costs for conversational or template-heavy workloads.

Can I rely on a single API key for this model?

Yes, Kyma uses one API key across all models and routes requests through an OpenAI-compatible endpoint at https://kymaapi.com/v1.

Needs a top-up — the signup credit covers the free tier.Create account →

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