Google Gemini API review

The Gemini API is the strongest all-round pick for teams that care about price per token and context length at the same time. Google publishes a free tier where input and output are free of charge on many models, so a prototype can run without a card. Paid prices are low: Gemini 2.5 Flash-Lite costs $0.10 per 1M text input tokens and Gemini 3.5 Flash-Lite $0.30 in and $2.50 out, while the flagship Gemini 4 Argon offers a 1M-token context and long decodes. Each model has Standard, Batch, Flex and Priority modes, and tools such as Google Search grounding include 5,000 free requests a month on Gemini 3 and newer models before per-request fees. Rate limits follow tiers: Tier 1 needs a linked billing account, Tier 2 needs $100 paid plus 3 days, and Tier 3 needs $1,000 plus 30 days. The trade-off is complexity: there are many models and modes, thinking tokens are billed, and the top model is paid only.

Who it is for

Developers who want a free tier to prototype on, very low per-token prices and long context in one API.

Price

Free tier on many models; paid from $0.10 per 1M input tokens on Gemini 2.5 Flash-Lite.

Input price (text, image, video) * Free of charge * $0.10 (text / image / video) $0.30 (audio)
Quoted from the vendor pricing page on November 7, 2026.

Key features

• Free tier with free-of-charge input and output on many models
• Standard, Batch, Flex and Priority processing modes
• Grounding with Google Search and Google Maps
• Context caching with a separate per-hour storage price
• Live API for low-latency audio-to-audio models

Strengths and weaknesses

• Strength: The only major first-party API here with a real free tier
• Strength: 1M-token context on Gemini 4 Argon and other current models
• Strength: Spend-based tiers upgrade automatically once billing is linked
• Weakness: Gemini 4 Argon is not available on the free tier
• Weakness: Thinking tokens and tool system instructions are billed as tokens
• Weakness: Many model versions and processing modes make cost estimates harder

Key facts

• Cheapest paid text input: $0.10 per 1M tokens (Gemini 2.5 Flash-Lite)
• Gemini 3.5 Flash-Lite: $0.30 in, $2.50 out per 1M tokens
• Context: 1M tokens on Gemini 4 Argon
• Tier 2: Paid $100 plus 3 days from first payment

Where it ranks

Google Gemini API is No. 1 in our Best LLM APIs verdict.