Cheapest models

Ranked by blended API price (75% input + 25% output, USD per 1M tokens). Free promotional listings excluded. Source: OpenRouter. Variants (reasoning effort, batch) are folded into one row.

#	Model	Capability	AA index	Reasoning	Math	Coding	Context	$/M	Weights	Released
1	GNano Banana 2 Lite (Gemini 3.1 Flash Lite Image)Google	—	—	—	—	—	66K	$0.56	—	30 Jun 2026
2	GNano Banana (Gemini 2.5 Flash Image)Google	—	—	—	—	—	33K	$0.85	—	7 Oct 2025
3	GNano Banana 2 (Gemini 3.1 Flash Image Preview)Google	—	—	—	—	—	66K	$1.13	—	26 Feb 2026
4	GNano Banana 2 (Gemini 3.1 Flash Image)Google	—	—	—	—	—	131K	$1.13	—	18 Jun 2026
5	OGPT-5 Image MiniOpenAI	—	—	—	—	—	400K	$2.38	—	16 Oct 2025
6	GNano Banana Pro (Gemini 3 Pro Image Preview)Google	—	—	—	—	—	66K	$4.50	—	20 Nov 2025
7	GNano Banana Pro (Gemini 3 Pro Image)Google	—	—	—	—	—	131K	$4.50	—	18 Jun 2026
8	OGPT-5.4 Image 2OpenAI	—	—	—	—	—	272K	$9.75	—	21 Apr 2026
9	OGPT-5 ImageOpenAI	—	—	—	—	—	400K	$10.00	—	14 Oct 2025

• AClaude Sonnet 5.5
  Anthropic · 28 Sep 2026 · AA 56 · 1M · $4.00/M
• AQwen3.8 Max Prime
  Alibaba (Qwen) · 23 Sep 2026 · 1M · $6.00/M
• OGPT-6 Sol
  OpenAI · 22 Sep 2026 · AA 47.5 · 1.05M · $4.00/M
• OGPT-6 Luna
  OpenAI · 22 Sep 2026 · AA 37.3 · 1.05M · $0.20/M
• OGPT-6 Sol Pro
  OpenAI · 22 Sep 2026 · 1.05M · $4.00/M
• OGPT-6 Luna Pro
  OpenAI · 22 Sep 2026 · 1.05M · $0.20/M
• AClaude Opus 5.5
  Anthropic · 22 Sep 2026 · AA 57.6 · 1M · $8.00/M
• XGrok 4.7
  xAI · 21 Sep 2026 · AA 46.4 · 500K · $3.00/M

Not ranked until an independent evaluator (Epoch AI) publishes scores. We don't use vendor-reported benchmark claims for rankings.