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GPT-6.1 Terra Pro vs Mercury 3

Detailed technical comparison between GPT-6.1 Terra Pro (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.

⚡ Executive Summary & Verdict

Comparison Snapshot

GPT-6.1 Terra Pro: 6 WinsvsMercury 3: 0 Wins
Context Leader

GPT-6.1 Terra Pro

1,050,000 tokens
Agentic Tool-Calling

Tie

Equal Capability
Lowest Latency (TTFT)

Tie

Equal Speed
Input Price Leader

Mercury 3

$0.10 / MTok
OpenAIactive

GPT-6.1 Terra Pro

GPT-6.1 Terra Pro is the same underlying model as [GPT-6.1 Terra](https://openrouter.ai/openai/gpt-6.1-terra), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. **Cost note:** pro mode spends far more...

View GPT-6.1 Terra Pro Full Specs →
Inception AIactive

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...

View Mercury 3 Full Specs →

Technical Specifications

🏆 = Superior Spec
SpecificationGPT-6.1 Terra ProMercury 3
ProviderOpenAIInception AI
Context Window1,050,000 tokens🏆1,000,000 tokens
Agent SuitabilityNot yet benchmarkedNot yet benchmarked
Time to First Token (TTFT)No public TTFT dataNo public TTFT data
Deployment Modelmanaged apimanaged api
Production StabilityNot verifiedNot verified
API AvailableYesYes
Released Date2026-10-262026-10-16

API Pricing Comparison

Input Price per Million Tokens

GPT-6.1 Terra Pro

$1.00

Mercury 3

$0.10

Output Price per Million Tokens

GPT-6.1 Terra Pro

$5.00

Mercury 3

$0.35

💡 Cost Ratio: Mercury 3 is 10.0x cheaper per input token than GPT-6.1 Terra Pro.

Want to test both models live?

Run side-by-side prompt benchmarks in our dynamic multi-model Sandbox. Compare execution speeds, latency metrics, and compute actual costs in real-time.

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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.

MMLUGeneral knowledge & multi-task understanding
88.4%vs79.4%+9.0% GPT-6.1 Terra Pro
GPT-6.1 Terra Pro 🏆
Mercury 3
HumanEvalPython coding & logic synthesis
87.6%vs77.6%+10.0% GPT-6.1 Terra Pro
GPT-6.1 Terra Pro 🏆
Mercury 3
MATHComplex mathematical problem solving
65.4%vs54.8%+10.6% GPT-6.1 Terra Pro
GPT-6.1 Terra Pro 🏆
Mercury 3
GPQAGraduate-level expert reasoning
46.8%vs40.2%+6.6% GPT-6.1 Terra Pro
GPT-6.1 Terra Pro 🏆
Mercury 3
HellaSwagCommonsense reasoning and inference
86.0%vs82.4%+3.6% GPT-6.1 Terra Pro
GPT-6.1 Terra Pro 🏆
Mercury 3
MT-BenchMulti-turn conversation flow quality
8.9%vs8.5%+0.4% GPT-6.1 Terra Pro
GPT-6.1 Terra Pro 🏆
Mercury 3

GPT-6.1 Terra Pro Quirks & Gotchas

No developer gotchas reported.

Mercury 3 Quirks & Gotchas

No developer gotchas reported.

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