GPT-5.6 Terra vs o3-pro
Pricing verdict: GPT-5.6 Terra vs o3-pro: GPT-5.6 Terra is cheaper for input-heavy usage ($2.50/M vs $20.00/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
o3-pro
Cost Differences
o3-pro 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 $150.00/month ($1,825.00/year) versus o3-pro.
Feature Comparison
| Feature | GPT-5.6 Terra | o3-pro |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Input Price | $2.50/1M tokens | $20.00/1M tokens |
| Output Price | $15.00/1M tokens | $80.00/1M tokens |
| Context Window | 1,050,000 tokens | 1,000,000 tokens |
| Max Output | 128,000 tokens | 131,072 tokens |
| Category | balanced | reasoning |
| Capabilities | textvisioncodereasoning | textreasoningcode |
| Release Date | 6/26/2026 | 6/10/2025 |
GPT-5.6 Terra vs o3-pro: Which Should You Choose?
Choosing between GPT-5.6 Terra and o3-pro 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 — 88% cheaper than o3-pro. Meanwhile, GPT-5.6 Terra offers a significantly larger context window at 1,050,000 tokens vs 1,000,000 for o3-pro.
These models target different tiers: GPT-5.6 Terra is a balanced model while o3-pro is reasoning. This means they're optimized for different workloads. o3-pro 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 $80.00 for o3-pro. 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: GPT-5.6 Terra supports vision (image inputs) while o3-pro is text-only. If your application needs image understanding, this narrows your choice.
Best Use Cases
Choose GPT-5.6 Terra when:
- • Budget is a primary concern
- • You need a larger context window (1,050,000 tokens)
- • You need more capabilities (vision)
- • You're already using OpenAI's API ecosystem
Choose o3-pro when:
- • You need longer outputs (up to 131,072 tokens)
- • 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.
o3-pro
- • Input pricing: $20.00/M tokens
- • Output pricing: $80.00/M tokens
- • Context window: 1,000,000 tokens
- • Max output: 131,072 tokens
Watch out for
- • Higher input cost than GPT-5.6 Terra
- • Higher output cost than GPT-5.6 Terra
- • Smaller context window 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)
o3-pro (OpenAI)
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What is the context window difference between GPT-5.6 Terra and o3-pro?▼
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