Anthropic Launches Claude Opus 5.5 at 40% Lower Cost Than Opus 5
Anthropic released Claude Opus 5.5 on September 22, 2026 at $4/$20 per million tokens, with Fable-class safeguards and four breaking API changes to plan for.
Models & Releases
News about frontier AI model releases and updates from OpenAI, Anthropic, Google DeepMind, xAI and others, explained for developers.
16 stories
New frontier models arrive every few weeks, each claiming better reasoning, coding or multimodal abilities. This category covers the major model launches and updates, including what changed, how the models are priced and accessed through APIs, and what each release means for the applications you build.
Anthropic Launches Claude Sonnet 5, Its Most Agentic Sonnet Model
Anthropic released Claude Sonnet 5 on June 30, 2026, an agentic model close to Opus 4.8 at $2/$10 per million tokens and the new default on Free and Pro plans.
Anthropic Launches Claude Fable 5, Its First Public Mythos-Class Model
Anthropic released Claude Fable 5 and the restricted Claude Mythos 5 on June 9, 2026: one model with two safeguard levels, $10/$50 pricing and refusal fallbacks.
Google Launches Gemini 3.5 Flash at I/O 2026 for Agents and Coding
Google opened its Gemini 3.5 series at I/O on May 19, 2026, with Gemini 3.5 Flash, which it says beats Gemini 3.1 Pro on agent benchmarks, at $1.50/$9 pricing.
OpenAI Releases GPT-5.5, Its Strongest Agentic Coding Model Yet
OpenAI released GPT-5.5 on April 23, 2026, with top agentic coding scores and GPT-5.4-level latency, then brought it to the API at $5/$30 per million tokens.
OpenAI Launches GPT-5.4 with Native Computer Use and 1M-Token Context
OpenAI released GPT-5.4 on March 5, 2026, with native computer use, tool search and a 1M-token API context, priced at $2.50 and $15 per million tokens.
Google Releases Gemini 3.1 Pro in Preview with Big Reasoning Gains
Google released Gemini 3.1 Pro in preview on February 19, 2026, reporting 77.1% on ARC-AGI-2, adding a medium thinking level and keeping $2/$12 pricing.
Anthropic Releases Claude Opus 4.6 with a 1M-Token Context Window
Anthropic's Claude Opus 4.6 (February 5, 2026) added a 1M-token context in beta, adaptive thinking and agent teams, while keeping $5/$25 pricing.
Google Launches Gemini 3 Pro, Topping LMArena and Debuting Antigravity
Google released Gemini 3 on November 18, 2025, starting with Gemini 3 Pro in preview, which topped LMArena at 1501 Elo and launched with Antigravity.
Anthropic Releases Claude Sonnet 4.5, Its Top Model for Coding Agents
Anthropic's Claude Sonnet 4.5, released September 29, 2025, led SWE-bench Verified and OSWorld at Sonnet pricing and arrived with the Claude Agent SDK.
OpenAI Launches GPT-5, a Unified Model That Decides When to Think
OpenAI released GPT-5 on August 7, 2025, merging fast answers and deep reasoning in one system, with new API controls, lower prices and fewer hallucinations.
xAI Launches Grok 4 and Grok 4 Heavy, Claiming Top Reasoning Scores
xAI released Grok 4 and the multi-agent Grok 4 Heavy on July 9, 2025, with a 256K-token API priced at $3 and $15 per million tokens and strong benchmark claims.
Gemini 2.5 Pro and Flash Reach General Availability on Google Cloud
Google made Gemini 2.5 Pro and 2.5 Flash generally available on June 17, 2025, previewed 2.5 Flash-Lite and gave developers stable thinking models.
Anthropic Launches Claude Opus 4 and Claude Sonnet 4 for Coding Agents
Anthropic's Claude Opus 4 and Sonnet 4 (May 22, 2025) led coding benchmarks, added tool use during extended thinking and made Claude Code generally available.
OpenAI Releases o3 and o4-mini, Reasoning Models That Use Tools
OpenAI's o3 and o4-mini, released April 16, 2025, reason with tools and images, posted strong coding and math results and reached developers through the API.
OpenAI Launches GPT-4.1 in the API with a 1M-Token Context Window
OpenAI released GPT-4.1, mini and nano in April 2025: API-first models with a 1M-token context, stronger coding and more literal instruction following.
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