Claude Opus 5.5 alternatives
10 models list the same capabilities as Claude Opus 5.5 (tool calling, reasoning, structured outputs and image input), take at least as long a prompt, and cost less per token on OceanToken. The cheapest is GPT-6 Luna Pro, 97% below Claude Opus 5.5.
Up to 97% less than Claude Opus 5.5
$0.10 / $0.50 $3.60 / $18.00 per 1M input / output tokens
Cheaper models with the same capabilities 10
| Model | Context | Input / output per 1M | vs Claude Opus 5.5 | Side by side |
|---|---|---|---|---|
| Claude Opus 5.5 itselfanthropic/claude-opus-5.5 | 1M | $3.60 / $18.00 | – | – |
| GPT-6 Luna Proopenai/gpt-6-luna-pro | 1.05M | $0.10 / $0.50 | 97% less | Compare |
| GLM 5.3 Flashz-ai/glm-5.3-flash | 1.05M | $0.15 / $0.50 | 97% less | Compare |
| DeepSeek V4.1 Flash (1017)deepseek/deepseek-v4.1-flash-1017 | 1.05M | $0.21 / $0.84 | 95% less | Compare |
| Qwen3.8 27Bqwen/qwen3.8-27b | 1.02M | $0.425 / $2.55 | 86% less | Compare |
| Grok 4.3x-ai/grok-4.3 | 1M | $1.25 / $2.50 | 83% less | Compare |
| Gemini 3.7 Flashgoogle/gemini-3.7-flash | 1.05M | $0.675 / $3.375 | 81% less | Compare |
| Gemini 3.8 Flashgoogle/gemini-3.8-flash | 1.05M | $0.675 / $3.375 | 81% less | Compare |
| GPT-6.1 Terraopenai/gpt-6.1-terra | 1.05M | $0.90 / $4.50 | 75% less | Compare |
| Gemini 3.5 Flashgoogle/gemini-3.5-flash | 1.05M | $1.35 / $8.10 | 56% less | Compare |
| Gemini 4 Argongoogle/gemini-4-argon | 1.05M | $1.80 / $9.00 | 50% less | Compare |
About these prices
Frequently asked questions
What is the cheapest alternative to Claude Opus 5.5?
GPT-6 Luna Pro: $0.10 / $0.50 per 1M input and output tokens, against $3.60 / $18.00 for Claude Opus 5.5, 97% less per token on OceanToken. It lists tool calling, reasoning, structured outputs and image input, as Claude Opus 5.5 does.
How do I switch from Claude Opus 5.5 to another model?
Every model is on the same API: keep the base URL https://api.oceantoken.ai/v1 and your key, and change the model id from anthropic/claude-opus-5.5 to, for example, openai/gpt-6-luna-pro.
Is a cheaper model as good as Claude Opus 5.5?
The price and the listed capabilities are facts this page can show; how well a model does your task is not. Run the same prompts on two models: with one key, switching is a one-line change.
Get API Key Claude Opus 5.5 Claude API
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