GPT-5.6 Terra vs GPT-6 Astra
Pricing verdict: GPT-5.6 Terra vs GPT-6 Astra: GPT-5.6 Terra is cheaper for input-heavy usage ($2.50/M vs $10.00/M input tokens), while GPT-5.6 Terra is better for long-context tasks (1,050,000 tokens).
Direct answer: choose GPT-5.6 Terra for lower token spend and choose GPT-5.6 Terra when your workload needs longer context.
Compare API pricing, input and output token costs, context windows, and monthly estimates on one page so you can pick the right model fast.
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
GPT-5.6 Terra
GPT-6 Astra
Cost Differences
GPT-6 Astra costs more than GPT-5.6 Terra
Quick Recommendation
Winner for direct API pricing: GPT-5.6 Terra. At the default workload, GPT-5.6 Terra saves about $75.00/month ($912.50/year) versus GPT-6 Astra.
Feature Comparison
| Feature | GPT-5.6 Terra | GPT-6 Astra |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Input Price | $2.50/1M tokens | $10.00/1M tokens |
| Output Price | $15.00/1M tokens | $50.00/1M tokens |
| Context Window | 1,050,000 tokens | 1,050,000 tokens |
| Max Output | 128,000 tokens | 128,000 tokens |
| Category | balanced | flagship |
| Capabilities | textvisioncodereasoning | textvisioncodereasoning |
| Release Date | 6/26/2026 | 9/3/2026 |
GPT-5.6 Terra vs GPT-6 Astra: Which Should You Choose?
Choosing between GPT-5.6 Terra and GPT-6 Astra depends on your priorities: cost efficiency, context length, or raw capability. GPT-5.6 Terra is the more affordable option at $2.50/1M input tokens — 75% cheaper than GPT-6 Astra.
These models target different tiers: GPT-5.6 Terra is a balanced model while GPT-6 Astra is flagship. This means they're optimized for different workloads. GPT-6 Astra targets more demanding workloads, while GPT-5.6 Terra provides a cost-effective option for everyday tasks.
Output costs matter too. GPT-5.6 Terra charges $15.00/1M output tokens vs $50.00 for GPT-6 Astra. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. GPT-5.6 Terra has the edge here at $15.00/1M output tokens.
Multimodal capabilities: Both models support vision (image understanding), so you can send images alongside text prompts with either option.
Best Use Cases
Choose GPT-5.6 Terra when:
- • Budget is a primary concern
- • You're already using OpenAI's API ecosystem
Choose GPT-6 Astra when:
- • You're already using OpenAI's API ecosystem
Pros and Caveats at a Glance
GPT-5.6 Terra
- • Input pricing: $2.50/M tokens
- • Output pricing: $15.00/M tokens
- • Context window: 1,050,000 tokens
- • Max output: 128,000 tokens
Watch out for
- • Trade-offs are minor in this matchup.
GPT-6 Astra
- • Input pricing: $10.00/M tokens
- • Output pricing: $50.00/M tokens
- • Context window: 1,050,000 tokens
- • Max output: 128,000 tokens
Watch out for
- • Higher input cost than GPT-5.6 Terra
- • Higher output cost than GPT-5.6 Terra
Try Different Scenarios
Use the calculator below to see how costs change with different usage patterns
GPT-5.6 Terra (OpenAI)
GPT-6 Astra (OpenAI)
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Which is cheaper, GPT-5.6 Terra or GPT-6 Astra?▼
What is the context window difference between GPT-5.6 Terra and GPT-6 Astra?▼
Which model is better for AI Agent / Agentic Workflows?▼
Which model has better overall pricing for heavy usage?▼
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