LLM API Pricing Comparison

Current prices for the main OpenAI, Anthropic and Google models, taken from each provider's own pricing page.

Quick answer

The cheapest models here by list price are GPT-6 Luna and Claude Haiku 5.5 (tied). Two prices are about to double: Gemini 4 Argon on December 1, 2026 and Gemini 3.8 Flash on January 1, 2027.

Every model, side by side

Model	Provider	Input	Cached input	Output	Batch in / out	1,000 typical requests
Claude Fable 5.1 `claude-fable-5-1`	Anthropic	$10.00	$0.25	$50.00	$5.00 / $25.00	$40.00
Claude Opus 5.5 `claude-opus-5-5`	Anthropic	$4.00	$0.20	$20.00	$2.00 / $10.00	$16.00
Claude Sonnet 5.5 `claude-sonnet-5-5`	Anthropic	$2.00	$0.10	$10.00	$1.00 / $5.00	$8.00
Claude Haiku 5.5 `claude-haiku-5-5`	Anthropic	$0.10	$0.01	$0.50	$0.05 / $0.25	$0.40
Gemini 4 Argon `gemini-4-argon`	Google	$2.00	$0.10	$10.00	$1.00 / $5.00	$8.00
Gemini 3.1 Pro (preview) `gemini-3.1-pro-preview`	Google	$2.00	$0.20	$12.00	$1.00 / $6.00	$8.80
Gemini 3.8 Flash `gemini-3.8-flash`	Google	$0.75	$0.075	$3.75	$0.375 / $1.88	$3.00
Gemini 3.5 Flash-Lite `gemini-3.5-flash-lite`	Google	$0.30	$0.03	$2.50	$0.15 / $1.25	$1.60
Gemini 3.1 Flash-Lite `gemini-3.1-flash-lite`	Google	$0.25	$0.025	$1.50	$0.125 / $0.75	$1.10
GPT-6 Astra `gpt-6-astra`	OpenAI	$10.00	$1.00	$50.00	$5.00 / $25.00	$40.00
GPT-6.1 Sol `gpt-6.1-sol`	OpenAI	$2.00	$0.10	$10.00	$1.00 / $5.00	$8.00
GPT-6.1 Terra `gpt-6.1-terra`	OpenAI	$1.00	$0.05	$5.00	$0.50 / $2.50	$4.00
GPT-6 Luna `gpt-6-luna`	OpenAI	$0.10	$0.01	$0.50	$0.05 / $0.25	$0.40

USD per 1M tokens, standard tier. A typical request here is 2,000 input and 400 output tokens, with no caching. Anthropic's "cached input" is its cache-read price; cache writes cost extra.

Cheapest first

GPT-6 Luna: $0.40 per 1,000 typical requests
Claude Haiku 5.5: $0.40 per 1,000 typical requests
Gemini 3.1 Flash-Lite: $1.10 per 1,000 typical requests
Gemini 3.5 Flash-Lite: $1.60 per 1,000 typical requests
Gemini 3.8 Flash: $3.00 per 1,000 typical requests
GPT-6.1 Terra: $4.00 per 1,000 typical requests
GPT-6.1 Sol: $8.00 per 1,000 typical requests
Claude Sonnet 5.5: $8.00 per 1,000 typical requests
Gemini 4 Argon: $8.00 per 1,000 typical requests
Gemini 3.1 Pro (preview): $8.80 per 1,000 typical requests
Claude Opus 5.5: $16.00 per 1,000 typical requests
GPT-6 Astra: $40.00 per 1,000 typical requests
Claude Fable 5.1: $40.00 per 1,000 typical requests

Upcoming price changes

Gemini 4 Argon rises to $4.00 / $20.00 on December 1, 2026.
Gemini 3.8 Flash rises to $1.50 / $7.50 on January 1, 2027.

By provider

Head to head

Price per token is only half the story

Tokenizers differ, so the same text can be more tokens on one model than another. Reasoning models bill thinking as output. And a cheaper model that fails costs more than one that succeeds. Compare cost per successful task on your own requests, using the price comparison calculator as a starting point.

Frequently asked questions

What is the cheapest LLM API?

Among the models here, by list price per typical request: GPT-6 Luna and Claude Haiku 5.5 (tied), at $0.40 per 1,000 requests of 2,000 input and 400 output tokens, followed by Gemini 3.1 Flash-Lite. The cheapest model for you is the one with the lowest cost per successful task.

How often are these prices updated?

Prices were checked on each provider's pricing page on October 30, 2026. Providers change prices often, so check their pages before you commit.

Which LLM price changes are coming?

Gemini 4 Argon doubles on December 1, 2026, and Gemini 3.8 Flash doubles on January 1, 2027, according to Google's pricing page.

Sources: OpenAI's API pricing page, Anthropic's pricing page, Google's Gemini API pricing page. Checked October 30, 2026.

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