We provide support for almost all the mainstream LLMs(large language models), users need to provide or buy LLM API KEY themselves. Which LLM is the most suitable for you, which is more cost-effective, the following gives you some reference information.
Prices below were collected from the official pricing pages of each vendor on October 18, 2026, in USD per million tokens.
Before making a price comparison, we first need to figure out what a token is. In the field of Artificial Intelligence and Natural Language Processing, Token is the basic unit of text after segmentation. The number of English words contained in a Token is not fixed. In English, common short words such as "the" "and" are a Token, while longer words such as "hesitation" are also a Token. As a rough estimate, on average, an English Token may correspond to 3–5 letters.
We select the latest flagship model from each of the large model vendors: GPT-6 Astra (OpenAI), Claude Opus 5.5 (Anthropic), Gemini 4 Argon (Google) and DeepSeek V4 Pro (DeepSeek). I hope this comparison serves as a reference for selecting your model.
The price spread at the very top is now enormous: Google's newest flagship is $10 / $50 today but will double to $4 / $20 in December, while OpenAI's most intelligent model costs $10 / $50 — and DeepSeek delivers a frontier-class 1M-context model for pocket change.
Here we compare the four latest flagship AI models to give you a reference.
GPT-6 Astra (OpenAI)
Input $10.00/million Tokens, Output $50.00/million Tokens (short context, up to 272K; long context $20.00 / $75.00). Cached input is $1.00/million Tokens, batch processing is half price.
OpenAI's most intelligent model, leading performance on coding, agentic and complex reasoning tasks; the whole GPT-6 family (Astra, Sol, Luna) shares this generation's architecture.
The most capable model you can buy — priced accordingly. Reserve it for the hardest research problems; GPT-6.1 Sol ($2 / $10) covers everyday work at a fifth of the cost.
Claude Opus 5.5 (Anthropic)
Input $4.00/million Tokens, Output $20.00/million Tokens. Fast mode (up to 2.5x speed) costs 2x; batch processing saves 50%.
Anthropic's most intelligent current model — best-in-class long-document comprehension, writing quality and professional reasoning, with an optional 2.5x fast mode for interactive work.
The strongest price/intelligence balance among the premium flagships: half the price of GPT-6 Astra with near-parity on hard reasoning tasks.
Gemini 4 Argon (Google)
Input $2.00/million Tokens, Output $10.00/million Tokens — promotional pricing until Nov 30, 2026; it doubles to $4.00 / $20.00 from Dec 1, 2026. Batch is half price.
Google's newest flagship with full multimodal input (text, image, video, audio) and a huge context window; after the December increase it lands at the same level as Claude Opus 5.5.
The cheapest ticket to a top-tier flagship — lock in workloads before the December price rise, after which it matches Opus 5.5 while Astra remains 2.5x more expensive.
DeepSeek V4 Pro (deepseek-v4-pro)
Input $1.32/million Tokens (peak; off-peak $0.66, cache hit only $0.044), Output $3.96/million Tokens (peak; off-peak $1.98).
DeepSeek's strongest reasoning model with 1M-token context and 384K max output; open-source lineage and aggressive off-peak discounting (all hours outside 01:00-04:00 and 06:00-10:00 UTC, Mon-Fri, are off-peak).
Frontier-class reasoning at roughly a tenth of the flagship price — the definitive budget champion for bulk literature screening and long-context work, though it lacks vision support (use DeepSeek V4.1 Flash for that).
For pure capability per dollar, DeepSeek V4 Pro is untouchable — frontier reasoning with 1M context at $1.32 / $3.96 peak. Among the Western flagships, Gemini 4 Argon ($2 / $10 until Nov 30) is the value pick, and Claude Opus 5.5 offers the best intelligence-to-price ratio once Gemini's December increase lands. GPT-6 Astra is the capability ceiling, best saved for tasks the others fail.
| Model | Input Price(USD/Million Tokens) | Output Price(USD/Million Tokens) | Value for Money Highlights |
|---|---|---|---|
| GPT-6 Astra | 10.00 | 50.00 | OpenAI's most intelligent model; long context $20.00 / $75.00, batch 50% off |
| Claude Opus 5.5 | 4.00 | 20.00 | Best price/intelligence balance, optional 2.5x fast mode at 2x price |
| Gemini 4 Argon | 2.00 | 10.00 | Cheapest flagship, full multimodal — doubles to $4.00 / $20.00 from Dec 1, 2026 |
| DeepSeek V4 Pro | 1.32 | 3.96 | Frontier reasoning at a tenth of the price, 1M context, half price off-peak |
Here is a price table for more current-generation models (standard tier, USD per million tokens, Oct 2026).
| Model | Input Price(USD/Million Tokens) | Output Price(USD/Million Tokens) | Comments |
|---|---|---|---|
| GPT-6 Astra | 10.00 | 50.00 | OpenAI's most intelligent model; long context (over 272K) $20.00 / $75.00 |
| GPT-6.1 Sol / GPT-6 Sol | 2.00 | 10.00 | The current default workhorse; long context $4.00 / $15.00 |
| GPT-6 Luna | 0.10 | 0.50 | Ultra-cheap small model for high-volume tasks |
| Claude Opus 5.5 | 4.00 | 20.00 | Anthropic's most intelligent current model, fast mode at 2x price |
| Claude Fable 5.1 | 10.00 | 50.00 | Premium creative/complex-task tier |
| Claude Sonnet 5.5 | 2.00 | 10.00 | Current best-value Claude |
| Claude Haiku 5.5 | 0.10 | 0.50 | Prompts up to 100K tokens; $0.50 / $2.50 above 100K |
| Gemini 4 Argon | 2.00 | 10.00 | Google's newest flagship; rises to $4.00 / $20.00 from Dec 1, 2026 |
| Gemini 3.8 Flash / 3.6 Flash | 0.75 | 3.75 | Hybrid reasoning, multimodal; doubles to $1.50 / $7.50 from Jan 1, 2027 |
| Gemini 3.1 Pro Preview | 2.00 | 12.00 | Prompts up to 200K tokens; $4.00 / $18.00 above 200K |
| Gemini 3.5 Flash-Lite | 0.30 | 2.50 | Small cost-effective model for at-scale usage |
| DeepSeek V4 Pro | 0.66 - 1.32 | 1.98 - 3.96 | Off-peak / peak; cache hit $0.022 - $0.044, strongest DeepSeek reasoning |
| DeepSeek V4.1 Flash (deepseek-flash) | 0.15 - 0.30 | 0.60 - 1.20 | Off-peak / peak input (cache hit $0.003 - $0.006) and output ranges; 1M context, vision |
Please note that model prices may change dynamically. In particular: Gemini 4 Argon rises on Dec 1, 2026 and Gemini 3.8 Flash doubles on Jan 1, 2027; DeepSeek charges half price in off-peak hours (all hours outside 01:00-04:00 and 06:00-10:00 UTC, Mon-Fri). You can get the current price here:
https://developers.openai.com/api/docs/pricing
https://ai.google.dev/gemini-api/docs/pricing
