Alternatives

# Best the OpenAI API Alternatives in October 2026

> The strongest alternative to the OpenAI API as of October 2026 is Claude Fable 5.1 from Anthropic: 1.7 points behind GPT-6 Astra, same price. Compared against GPT-6 Astra, the OpenAI API's current top model.
- Canonical page: https://noometry.com/alternatives/openai-api
- Last updated: 2026-10-10
- Title: Best the OpenAI API Alternatives (October 2026) | Noometry

The strongest alternative to the OpenAI API as of October 2026 is Claude Fable 5.1 from Anthropic: 1.7 points behind GPT-6 Astra, same price. Compared against GPT-6 Astra, the OpenAI API's current top model.

Last verified October 10, 2026

1.  ## [Claude Fable 5.1](https://noometry.com/models/claude-fable-5-1) Anthropic
    
    1.7 points behind GPT-6 Astra, same price.
    
    Score 69.0, $20 per M tokens blended.[Compare with GPT-6 Astra](https://noometry.com/compare/claude-fable-5-1-vs-gpt-6-astra)
    
2.  ## [Gemini 3.8 Flash](https://noometry.com/models/gemini-3-8-flash) Google
    
    9.0 points behind GPT-6 Astra, 13.3× cheaper per token.
    
    Score 61.8, $1.50 per M tokens blended.[Compare with GPT-6 Astra](https://noometry.com/compare/gemini-3-8-flash-vs-gpt-6-astra)
    
3.  ## [Kimi K3](https://noometry.com/models/kimi-k3) Moonshot AI
    
    11.2 points behind GPT-6 Astra, 3.3× cheaper per token; open weights.
    
    Score 59.5, $6 per M tokens blended.[Compare with GPT-6 Astra](https://noometry.com/compare/gpt-6-astra-vs-kimi-k3)
    
4.  ## [Grok 4.6](https://noometry.com/models/grok-4-6) xAI
    
    13.9 points behind GPT-6 Astra, 6.7× cheaper per token.
    
    Score 56.9, $3 per M tokens blended.[Compare with GPT-6 Astra](https://noometry.com/compare/gpt-6-astra-vs-grok-4-6)
    
5.  ## [Qwen3.8 Max](https://noometry.com/models/qwen3-8-max) Alibaba (Qwen)
    
    14.0 points behind GPT-6 Astra, 6.7× cheaper per token.
    
    Score 56.8, $3 per M tokens blended.[Compare with GPT-6 Astra](https://noometry.com/compare/gpt-6-astra-vs-qwen3-8-max)
    
6.  ## [GLM-5.3](https://noometry.com/models/glm-5-3) Z.ai (Zhipu)
    
    15.9 points behind GPT-6 Astra, 9.3× cheaper per token; open weights.
    
    Score 54.8, $2.15 per M tokens blended.[Compare with GPT-6 Astra](https://noometry.com/compare/glm-5-3-vs-gpt-6-astra)
    
7.  ## [Muse Spark 1.3](https://noometry.com/models/muse-spark-1-3) Meta
    
    16.0 points behind GPT-6 Astra, 10.0× cheaper per token.
    
    Score 54.8, $2 per M tokens blended.[Compare with GPT-6 Astra](https://noometry.com/compare/gpt-6-astra-vs-muse-spark-1-3)
    
8.  ## [DeepSeek V4 Pro](https://noometry.com/models/deepseek-v4-pro) DeepSeek
    
    16.4 points behind GPT-6 Astra, 20.2× cheaper per token; open weights.
    
    Score 54.3, $0.99 per M tokens blended.[Compare with GPT-6 Astra](https://noometry.com/compare/deepseek-v4-pro-vs-gpt-6-astra)
    

More: [Open-source](https://noometry.com/alternatives/openai-api/open-source), [Cheaper](https://noometry.com/alternatives/openai-api/cheaper), [For coding](https://noometry.com/alternatives/openai-api/coding)

## Frequently asked questions

### What is the best alternative to the OpenAI API?

The strongest alternative to the OpenAI API as of October 2026 is Claude Fable 5.1 from Anthropic: 1.7 points behind GPT-6 Astra, same price. Compared against GPT-6 Astra, the OpenAI API's current top model.

### How were these alternatives chosen?

Each is the highest-ranked model from a different provider, compared on the Noometry Index against GPT-6 Astra.