GPT-6.1 Terra vs Mercury 3
Detailed technical comparison between GPT-6.1 Terra (OpenAI) and Mercury 3 (Inception AI). Review live API token pricing, context window capabilities, time-to-first-token latency, and verified benchmark scores side-by-side.
Comparison Snapshot
GPT-6.1 Terra
1,050,000 tokensTie
Equal CapabilityTie
Equal SpeedMercury 3
$0.10 / MTokGPT-6.1 Terra
GPT-6.1 Terra is the mid-tier model in OpenAI's GPT-6.1 series, priced below GPT-6.1 Sol. It is suited for everyday agentic, coding, and writing work, is particularly strong at understanding screenshots...
Mercury 3
Mercury 3 is a diffusion-based language model from Inception, and the lab's most capable model to date. It is suited for agentic workflows and real-time applications where latency compounds, such...
Technical Specifications
🏆 = Superior Spec| Specification | GPT-6.1 Terra | Mercury 3 |
|---|---|---|
| Provider | OpenAI | Inception AI |
| Context Window | 1,050,000 tokens🏆 | 1,000,000 tokens |
| Agent Suitability | Not yet benchmarked | Not yet benchmarked |
| Time to First Token (TTFT) | No public TTFT data | No public TTFT data |
| Deployment Model | managed api | managed api |
| Production Stability | Not verified | Not verified |
| API Available | Yes | Yes |
| Released Date | 2026-10-26 | 2026-10-16 |
API Pricing Comparison
Input Price per Million Tokens
GPT-6.1 Terra
$1.00
Mercury 3
$0.10
Output Price per Million Tokens
GPT-6.1 Terra
$5.00
Mercury 3
$0.35
💡 Cost Ratio: Mercury 3 is 10.0x cheaper per input token than GPT-6.1 Terra.
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Benchmark Performance Metrics
Standardized Scores (0–100%)Scores show verified raw accuracy percentages across standardized AI evaluation suites. Higher bars indicate superior performance in that domain.
GPT-6.1 Terra Quirks & Gotchas
No developer gotchas reported.
Mercury 3 Quirks & Gotchas
No developer gotchas reported.
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