Features, performance comparisons, and selection guides for different models
From late September to early October, leading large language models rolled out updates in quick succession: Anthropic released Claude Opus 5.5 on September 22, and just eight days later, Google launched Gemini 4 Argon. The two models have a lot in common: both target long-chain reasoning, agentic coding, and enterprise knowledge work, and both have…
Developers have recently reported a counterintuitive experience: claude-opus-5-5 doesn’t feel slow at all. In fact, it often finishes tasks earlier than claude-sonnet-5-5. If the flagship model is both faster and stronger, is Sonnet’s only remaining advantage that it costs half as much? The answer isn’t that simple. This article uses six sets of public data…
On September 28, Anthropic released claude-sonnet-5-5. The very next day, OpenAI launched gpt-6.1-sol at DevDay. The new flagship workhorse models from both companies arrived back-to-back—and with exactly the same list price: $2 per million input tokens and $10 per million output tokens. Many developers’ first reaction was, “They’re both cheaper, so just pick either one.”…
Image generation selection has always been one of the most painful decisions for AI application teams. On July 24, 2026, Midjourney 8.2 became the default version, while OpenAI’s gpt-image-2 has already been running in production for more than three months since its April release. These two models are often compared side by side, but most…
In the APIYI technical support group, we were recently asked a very specific question: if you feed a model three images—Image 1 as the base scene, Image 2 as the object to be inserted, and Image 3 as a reference for color and atmosphere—along with a long prompt, which one actually produces higher quality and…
Following the launch of Gemini 3.5 Flash on May 19, 2026, the developer community isn't asking "does it work?" but rather "can it directly replace the Gemini 3.1 Pro Preview models we've been running since late last year?" Google has repeatedly emphasized that 3.5 Flash "outperforms 3.1 Pro" in coding, tool calling, and Agent tasks….
Many teams automatically migrated all their Gemini traffic to Gemini 3.5 Flash after its GA release on May 19, 2026, including high-frequency, lightweight tasks like translation, subtitle generation, and content moderation. This is a clear misjudgment. For scenarios where inputs and outputs are short, price-sensitive, latency-sensitive, and don't require agentic tool orchestration, Gemini 3.1 Flash-Lite…
In April 2026, Claude Opus 4.7 set a new benchmark for coding models with a 87.6% score on SWE-bench Verified. Yet, just two weeks later, xAI challenged the long-held consensus that "coding models must be expensive" by releasing Grok 4.3 at one-tenth the cost. This article answers the two questions developers care about most: Can…
In April 2026, two major models were released almost simultaneously: DeepSeek V4 Pro (April 24) and Grok 4.3 (April 30). On one side, we have a 1.6T parameter MoE architecture with an MIT open-source license and an 80.6% score on SWE-bench; on the other, a closed-source powerhouse featuring native video input and top-tier long-chain agent…
At the end of April 2026, xAI and OpenAI released two flagship reasoning models almost simultaneously: Grok 4.3 and GPT-5.5. One has pushed the price of reasoning models down to $1.25/$2.50, while the other has driven agentic coding performance to 82.7% on Terminal-Bench. Both product roadmaps have converged on a 1M context window at the…
