GPT-5.6 Terra Paid vs 
Claude Sonnet 5 Paid
GPT-5.6 Terra vs Claude Sonnet 5 compared — price per token, context window, multimodality, openness and which to choose. Full 2026 breakdown.
GPT-5.6 Terra — full profile › · Claude Sonnet 5 — full profile ›
Prices & specs refreshed from live data · olud.ai
Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.
$12 /M outputManaged API (no infra to run)
$10 /M outputManaged API (no infra to run)
GPT-5.6 Terra vs Claude Sonnet 5 specs
| Spec | GPT-5.6 Terra | Claude Sonnet 5 | Winner |
|---|---|---|---|
| Maker | OpenAI | Anthropic | – |
| Type | Proprietary | Proprietary | – |
| Context window | 1.1M tokens | 1M tokens | |
| Input price | $2/M | $2/M | = Tie |
| Output price | $12/M | $10/M | |
| Vision / multimodal | Yes | Yes | = Tie |
| Tool / function calling | Yes | Yes | = Tie |
| Self-hostable | No (API only) | No (API only) | – |
| License | Proprietary | Proprietary | – |
Price gap & when to choose each
- You want frontier performance through a managed API
- You need the longer 1.1M context window
- You value reliability & ecosystem
- You don't want to manage infrastructure
- You want frontier performance through a managed API
- You want the lower output price
- You value reliability & ecosystem
- You don't want to manage infrastructure
Feature comparison
| Capability | GPT-5.6 Terra | Claude Sonnet 5 |
|---|---|---|
| Open weights (downloadable) | ✗ | ✗ |
| Self-hostable | ✗ | ✗ |
| Runs fully offline | ✗ | ✗ |
| Vision / multimodal | ✓ | ✓ |
| Tool / function calling | ✓ | ✓ |
| 1M+ context window | ✓ | ✓ |
Benchmarks: GPT-5.6 Terra vs Claude Sonnet 5
Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).
Benchmark data by Artificial Analysis.
How GPT-5.6 Terra and Claude Sonnet 5 score
| Criterion | GPT-5.6 Terra | Claude Sonnet 5 |
|---|---|---|
| Cost-efficiency | 3.5 | 3.5 |
| Context window | 5.0 | 5.0 |
| Openness | 1.5 | 1.5 |
| Self-hosting | 1.0 | 1.0 |
| Multimodality | 5.0 | 5.0 |
Scores come from live data — output price (cost), context length, open vs closed weights (openness & self-hosting) and vision/tool support (multimodality). Raw task quality isn't scored here; it depends on your benchmark — see the verdict.
What each model is
GPT-5.6 Terra Paid
GPT-5.6 Terra is a balanced model in OpenAI's GPT-5.6 series, positioned between the flagship Sol tier and the cost-efficient Luna tier. It is suited for everyday coding, reasoning, and agentic...
Claude Sonnet 5 Paid
Sonnet 5 is Anthropic's most capable Sonnet-class model, with frontier performance across coding, agents, and professional work. It supports adaptive thinking with selectable reasoning effort levels (low, medium, high, max,...
Other models in these families
These variants are tracked but not compared here — one page per family keeps the comparison readable.
Frequently asked questions
GPT-5.6 Terra vs Claude Sonnet 5 — which is cheaper?
Claude Sonnet 5 is cheaper on output ($10/M vs $12/M).
Which has the larger context window?
GPT-5.6 Terra offers the larger context window (1.1M tokens).
GPT-5.6 Terra vs Claude Sonnet 5 — which should I pick in 2026?
Choose Claude Sonnet 5 for the lower output price ($10/M vs $12/M). Choose GPT-5.6 Terra if you need the larger 1.1M context window.
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