Claude Sonnet 4.6 vs GPT-5.6 Terra
Pricing verdict: Claude Sonnet 4.6 vs GPT-5.6 Terra: GPT-5.6 Terra is cheaper for input-heavy usage ($2.50/M vs $3.00/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)
Claude Sonnet 4.6
GPT-5.6 Terra
Cost Differences
GPT-5.6 Terra costs less than Claude Sonnet 4.6
Quick Recommendation
Winner for direct API pricing: GPT-5.6 Terra. At the default workload, GPT-5.6 Terra saves about $1.50/month ($18.25/year) versus Claude Sonnet 4.6.
Feature Comparison
| Feature | Claude Sonnet 4.6 | GPT-5.6 Terra |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Input Price | $3.00/1M tokens | $2.50/1M tokens |
| Output Price | $15.00/1M tokens | $15.00/1M tokens |
| Context Window | 1,000,000 tokens | 1,050,000 tokens |
| Max Output | 65,536 tokens | 128,000 tokens |
| Category | balanced | balanced |
| Capabilities | textvisioncodereasoningcomputer-use | textvisioncodereasoning |
| Release Date | 2/18/2026 | 6/26/2026 |
Claude Sonnet 4.6 vs GPT-5.6 Terra: Which Should You Choose?
Choosing between Claude Sonnet 4.6 and GPT-5.6 Terra 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 — 17% cheaper than Claude Sonnet 4.6. Meanwhile, GPT-5.6 Terra offers a significantly larger context window at 1,050,000 tokens vs 1,000,000 for Claude Sonnet 4.6.
These models come from different providers — Anthropic and OpenAI — which means different API ecosystems, SDKs, rate limits, and terms of service. If you're already integrated with Anthropic, switching to OpenAIinvolves migration effort beyond just pricing. Factor in your existing infrastructure when deciding.
Both models are in the balanced category, making this a direct head-to-head comparison. At scale — say 10,000 requests per day — the cost difference adds up: GPT-5.6 Terra would save you roughly $150.00/month compared to Claude Sonnet 4.6. For startups and indie developers, that difference can be significant.
Output costs matter too. Claude Sonnet 4.6 charges $15.00/1M output tokens vs $15.00 for GPT-5.6 Terra.
Multimodal capabilities: Both models support vision (image understanding), so you can send images alongside text prompts with either option.
Best Use Cases
Choose Claude Sonnet 4.6 when:
- • You need more capabilities (computer-use)
- • You're already using Anthropic's API ecosystem
Choose GPT-5.6 Terra when:
- • Budget is a primary concern
- • You need a larger context window (1,050,000 tokens)
- • You need longer outputs (up to 128,000 tokens)
- • You're already using OpenAI's API ecosystem
Pros and Caveats at a Glance
Claude Sonnet 4.6
- • Input pricing: $3.00/M tokens
- • Output pricing: $15.00/M tokens
- • Context window: 1,000,000 tokens
- • Max output: 65,536 tokens
Watch out for
- • Higher input cost than GPT-5.6 Terra
- • Smaller context window than GPT-5.6 Terra
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.
Try Different Scenarios
Use the calculator below to see how costs change with different usage patterns
Claude Sonnet 4.6 (Anthropic)
GPT-5.6 Terra (OpenAI)
Start using Claude Sonnet 4.6 today
Sign Up for Anthropic →Start using GPT-5.6 Terra today
Sign Up for OpenAI →Frequently Asked Questions
Which is cheaper, Claude Sonnet 4.6 or GPT-5.6 Terra?▼
What is the context window difference between Claude Sonnet 4.6 and GPT-5.6 Terra?▼
Which model is better for AI Agent / Agentic Workflows?▼
Which model has better overall pricing for heavy usage?▼
Where can I compare Anthropic and OpenAI API pricing beyond this model matchup?▼
Related Comparisons
Related Articles
Learn when to pick each model, then compare live pricing scenarios.