GPT-5.1-Codex is $1.25 cheaper per 1M input tokens (50% lower; 2x difference).
API cost decision in 10 seconds
GPT-5.1-Codex vs Nova Premier 1.0
Pick GPT-5.1-Codex for lower cost; pick Nova Premier 1.0 only if the larger context window matters more.
Pricing data updated:
Prices normalized to USD per 1M tokens
Sample workload: 1M input + 500K output
Budget verdict
Pick GPT-5.1-Codex for lower cost; pick Nova Premier 1.0 only if the larger context window matters more.
On the standard 1M input plus 500K output workload, GPT-5.1-Codex is estimated at $6.25 vs $8.75 for Nova Premier 1.0, saving $2.5 (28.6% lower).
Cost-first pickGPT-5.1-Codex
Context-first pickNova Premier 1.0
Sample savings$2.528.6%
10x traffic gap$25
Nova Premier 1.0 has more context, but GPT-5.1-Codex saves $2.5 on the standard workload. At 10x that traffic, the same price gap is about $25. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
GPT-5.1-Codex stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | GPT-5.1-Codex | Nova Premier 1.0 |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | GPT-5.1-Codex | $11.25 | $18.75 |
| Balanced workload | 1M input + 1M output | GPT-5.1-Codex | $11.25 | $15 |
| Output-heavy chatbot | 1M input + 5M output | GPT-5.1-Codex | $51.25 | $65 |
GPT-5.1-Codex is $2.5 cheaper per 1M output tokens (20% lower; 1.25x difference).
Nova Premier 1.0 has 600K more context (2.5x larger).
GPT-5.1-Codex is $2.5 cheaper on the standard workload (28.6% lower).
Estimate your workload cost
Your Workload Cost
This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.
Quick Decision
GPT-5.1-Codex has the lower input price; GPT-5.1-Codex has the lower output price; Nova Premier 1.0 offers the larger context window. For the 1M input plus 500K output sample, GPT-5.1-Codex is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $6.25 for GPT-5.1-Codex and $8.75 for Nova Premier 1.0.
Choose GPT-5.1-Codex when you care most about lower input-token price, and lower output-token price.
Choose Nova Premier 1.0 when you care most about larger context window.
- On the standard 1M input plus 500K output workload, GPT-5.1-Codex is estimated at $6.25 vs $8.75 for Nova Premier 1.0, saving $2.5 (28.6% lower).
- GPT-5.1-Codex is $2.5 cheaper on the standard workload (28.6% lower).
- GPT-5.1-Codex is $1.25 cheaper per 1M input tokens (50% lower; 2x difference).
- GPT-5.1-Codex is $2.5 cheaper per 1M output tokens (20% lower; 1.25x difference).
- Nova Premier 1.0 has 600K more context (2.5x larger).
| Feature | GPT-5.1-Codex (OpenAI) | Nova Premier 1.0 (Amazon) |
|---|---|---|
| Input Price prompt tokens per 1M | $1.25 | $2.5 |
| Completion Price per 1M tokens | $10 | $12.5 |
| Sample Workload Cost 1M input + 500K output | $6.25 | $8.75 |
| Context Window | 400K | 1M |
| Release Date |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | GPT-5.1-Codex | On the standard 1M input plus 500K output workload, GPT-5.1-Codex is estimated at $6.25 vs $8.75 for Nova Premier 1.0, saving $2.5 (28.6% lower). |
| High-volume input processing | GPT-5.1-Codex | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | GPT-5.1-Codex | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | Nova Premier 1.0 | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- gpt-oss-120b (free) can replace GPT-5.1-Codex when lower sample workload cost matters most: $0.
- gpt-oss-20b (free) can replace GPT-5.1-Codex when lower sample workload cost matters most: $0.
- gpt-oss-20b can replace GPT-5.1-Codex when lower sample workload cost matters most: $0.1.
- gpt-oss-120b can replace GPT-5.1-Codex when lower sample workload cost matters most: $0.13.
- Llama 4 Scout offers 10M context with $0.23 sample workload cost.
- Grok 4.20 Multi-Agent offers 2M context with $5 sample workload cost.
- Grok 4.20 offers 2M context with $2.5 sample workload cost.
- GPT-5.4 offers 1.05M context with $10 sample workload cost.
- No popular competitor is currently available.
Cheaper alternatives
Review low-cost models sorted by a standard 1M input plus 500K output workload.
Open cheapest modelsLarger context alternatives
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Open Amazon modelsGPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....
Amazon Nova Premier is the most capable of Amazon’s multimodal models for complex reasoning tasks and for use as the best teacher for distilling custom models.