By the toolist.ai editors. Researched from the providers' own pricing pages, not hands-on tested by toolist.ai. Prices checked October 13, 2026; we re-check them every week.

AI model API prices and comparisons

Of the newest models from Google, Meta, Anthropic and OpenAI, Claude Haiku 5.5 is the cheapest at $0.10 per million input tokens and $0.50 per million output tokens. GPT-6 Astra and Claude Fable 5.1 are the most expensive at $10 and $50. The table shows what each one costs for the same support chatbot workload, so you can compare a month's bill, not just a token price.

API price table

USD per million tokens at standard rates, newest model first. Support chatbot: 100,000 replies, each 3,000 input and 400 output tokens, no caching. Each model's page lists long-context, batch and fast-mode prices.

Head-to-head comparisons

• Claude Haiku 5.5 vs Claude Sonnet 5.5
• Claude Opus 5.5 vs Claude Fable 5.1
• Claude Opus 5.5 vs Claude Sonnet 5.5
• Claude Opus 5.5 vs GPT-6 Astra
• Claude Opus 5 vs GPT-6 Astra
• Gemini 4 Argon vs Claude Opus 5.5
• Gemini 4 Argon vs GPT-6 Astra
• GPT-6.1 Sol vs Claude Opus 5.5
• GPT-6.1 Sol vs Claude Sonnet 5.5
• GPT-6.1 Sol vs GPT-6 Astra
• GPT-6.1 Sol vs GPT-6 Sol
• Muse Wonder vs Claude Opus 5.5

The models

• Gemini 4 Argon: Gemini 4 Argon is the first Gemini 4 model, which Google calls its flagship reasoning model. It costs an introductory $2 per million input tokens and $10 per million output tokens through November 30, 2026, then $4 and $20 from December 1, and scores 52.6 on the Artificial Analysis Intelligence Index at high thinking.
• Muse Wonder: Muse Wonder is Meta's new reasoning model for coding and long-running agents, at $4 per million input tokens and $20 per million output tokens on the Meta Model API, against $1.25 and $4.25 for Muse Spark 1.3. Artificial Analysis puts it at 52.4 on its Intelligence Index at max effort. Muse Wonder Full, which Meta calls the higher-capability variant, is only in Muse Code, on the $50 and $200 monthly plans.
• Claude Haiku 5.5: Claude Haiku 5.5 is Anthropic's small, fast model for high-volume work such as classification, extraction, routing and subagents, at $0.10 per million input tokens and $0.50 per million output tokens, a tenth of Claude Haiku 4.5's price. Prompts over 100,000 tokens cost five times as much ($0.50 in, $2.50 out), and Artificial Analysis scores it 43.4 on its Intelligence Index at max effort.
• GPT-6.1 Sol: GPT-6.1 Sol is OpenAI's mid-tier GPT-6 model, at $2 per million input tokens and $10 per million output tokens, one fifth of GPT-6 Astra's price. OpenAI pitches it as close to Astra on coding and professional work, and Artificial Analysis puts it at 51.8 on its Intelligence Index against Astra's 52.7.
• Claude Sonnet 5.5: Claude Sonnet 5.5 is Anthropic's current Sonnet model, which Anthropic calls its best combination of speed and intelligence, at $2 per million input tokens and $10 per million output tokens, the same as Claude Sonnet 5. Artificial Analysis puts it at 56.0 on its Intelligence Index at max effort and 46.8 at high, the API default.
• Claude Opus 5.5: Claude Opus 5.5 is Anthropic's current Opus model and the one Anthropic recommends starting with, at $4 per million input tokens and $20 per million output tokens, 20% below Claude Opus 5. It scores 57.6 on the Artificial Analysis Intelligence Index at max effort.
• GPT-6 Sol: GPT-6 Sol is the original mid-tier GPT-6 model, at $2 per million input tokens and $10 per million output tokens. GPT-6.1 Sol replaced it as OpenAI's recommended Sol one week later at the same prices, but GPT-6 Sol is still on the API and is the faster of the two at max effort.
• GPT-6 Astra: GPT-6 Astra is OpenAI's most capable GPT-6 model, at $10 per million input tokens and $50 per million output tokens, five times GPT-6.1 Sol. OpenAI aims it at the hardest reasoning, coding and research work; on Artificial Analysis it scores 52.7 on the Intelligence Index, a point above GPT-6.1 Sol.
• Claude Fable 5.1: Claude Fable 5.1 is Anthropic's most capable model open to all customers, a tier above Opus, at $10 per million input tokens and $50 per million output tokens. Anthropic advises starting with Claude Opus 5.5 for most work and using Fable 5.1 for demanding reasoning and long-horizon agentic work; on Artificial Analysis, Opus 5.5 currently scores higher.
• Claude Opus 5: Claude Opus 5 is Anthropic's previous Opus model, released in July 2026 at $5 per million input tokens and $25 per million output tokens. Since September 22 it is a legacy model: Claude Opus 5.5 costs less and scores higher on every benchmark both models have a score for, so new projects should start there.

Other workloads

Document Q&A: 5,000 questions over the same 60,000-token document set (90% cache hits), 800 output tokens each (300M in, 4M out). Coding agent: 200 tasks, each 1.5 million input tokens (90% cache hits) and 50,000 output tokens (300M in, 10M out). Cached input is billed at the cache-read price; cache-write charges are not included.

How we gather and check these numbers: our method.

Sources

• Gemini API docs: Pricing (checked 2026-10-13)
• Meta Model API docs: Pricing and rate limits (checked 2026-10-13)
• Claude docs: Pricing (checked 2026-10-13)
• OpenAI API docs: Pricing (checked 2026-10-13)
• OpenAI API docs: GPT-6 Sol (checked 2026-10-13)