gpt-oss-20b vs Hermes 3 405B Instruct
Detailed technical comparison between gpt-oss-20b (OpenAI) and Hermes 3 405B Instruct (Nous Research). Review live API token pricing, context window capabilities, time-to-first-token latency, and verified benchmark scores side-by-side.
Comparison Snapshot
Tie
Equal CapacityTie
Equal CapabilityTie
Equal Speedgpt-oss-20b
$0.03 / MTokgpt-oss-20b
gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license. It uses a Mixture-of-Experts (MoE) architecture with 3.6B active parameters per forward pass, optimized for...
Hermes 3 405B Instruct
Hermes 3 is a generalist language model with many improvements over Hermes 2, including advanced agentic capabilities, much better roleplaying, reasoning, multi-turn conversation, long context coherence, and improvements across the...
Technical Specifications
🏆 = Superior Spec| Specification | gpt-oss-20b | Hermes 3 405B Instruct |
|---|---|---|
| Provider | OpenAI | Nous Research |
| Context Window | 131,072 tokens | 131,072 tokens |
| Agent Suitability | N/A | N/A |
| Time to First Token (TTFT) | N/A | N/A |
| Deployment Model | managed api | self hostable |
| Production Stability | stable | stable |
| API Available | Yes | Yes |
| Released Date | 2025-08-05 | 2024-08-16 |
API Pricing Comparison
Input Price per Million Tokens
gpt-oss-20b
$0.03
Hermes 3 405B Instruct
$1.00
Output Price per Million Tokens
gpt-oss-20b
$0.13
Hermes 3 405B Instruct
$1.00
💡 Cost Ratio: gpt-oss-20b is 33.3x cheaper per input token than Hermes 3 405B Instruct.
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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-oss-20b Quirks & Gotchas
No developer gotchas reported.
Hermes 3 405B Instruct Quirks & Gotchas
No developer gotchas reported.
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