By Sagar Shankaran, Founder of CallSphere
Three autonomous coding agents — Jules from Google, Devin from Cognition, Claude Code from Anthropic — compared. Practical context for teams in Portland, OR.
Key takeaways
Published 2026-05-04 | Updated 2026-05-05
Autonomous coding agents are crossing the chasm in 2026. Here is how the three leaders compare in real-PR throughput.
This briefing is written with builders in Portland, OR in mind — local procurement, latency from regional Google Cloud / AWS / Azure regions, and time-zone-friendly support windows shape the practical recommendations.
Google's April 2026 cadence around the Gemini 3 family, Antigravity, and the AgentSpace surface is the most coherent product narrative the company has put together in years. The pieces fit: a frontier model (Gemini 3 Pro), a fast variant (Gemini 3 Flash), an on-device tier (Gemini Nano), an IDE (Antigravity), an agent runtime (Vertex Reasoning Engine), an agent catalog (Agent Garden), an enterprise hub (AgentSpace), and a consumer notebook (NotebookLM Pro). For builders, the practical impact is that you can pick a Google story for almost any agent shape and have a credible delivery path from prototype to production.
For Portland, OR teams, the practical near-term move is to set up an evaluation harness against your top 3 production prompts before committing to a model swap.
On SWE-bench Verified, Gemini 3 Pro scores 71.8% — within striking distance of Claude Opus 4.7's 72.9% and ahead of GPT-5.5's 69.4%. On tau-bench retail, the new model lands at 95.1%, a meaningful jump from Gemini 2.5's 88.6%. MMMU sits at 84.0%. The numbers matter less than the spread: for the first time, the three frontier labs are within 3 percentage points of each other on most benchmarks that builders cite.
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Gemini 3 Pro is priced at $1.25 / $10.00 per million input/output tokens up to 200K context; long-context (>200K) tier kicks in at $2.50 / $15.00. With prompt caching at a 75% discount and a 50% Batch API discount on async workloads, the realized cost for many production agents lands closer to $0.80 per million blended tokens. Compared to Claude Opus 4.7 ($15/$75) and GPT-5.5 ($10/$30), Gemini 3 Pro is positioned as the price-aggressive frontier option.
This is the short version; the full vendor documentation has more nuance, particularly on rate limits and regional availability.
The recommended path is prototype in AI Studio, then promote to Vertex AI for production. Vertex provides regional availability (12 regions globally, including europe-west4 and asia-southeast1), VPC-SC, CMEK, audit logging, and the new Reasoning Engine managed runtime. AI Studio's prompt IDE got a major refresh — versioned prompts, side-by-side eval, and one-click deployment to Vertex are now first-class.
Google's open-protocol bet is real: A2A 1.0 ships as an open spec for agent-to-agent communication, complementing MCP 1.0 for tool integration. Vertex AI Agent Builder ships first-class A2A support, and Agent Garden's 80+ pre-built agents all advertise A2A endpoints. For builders, this means a Google-built sales agent can hand off to a third-party fulfillment agent (running on AWS or self-hosted) without custom integration glue.
For Portland, OR teams, the practical near-term move is to set up an evaluation harness against your top 3 production prompts before committing to a model swap.
A migration without answers to these questions is a Q4 incident report waiting to happen:
Q: Is Gemini 3 Pro available in my region?
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A: Gemini 3 Pro is generally available in 12 Vertex AI regions as of May 2026, including us-central1, europe-west4, asia-southeast1, and asia-northeast1. Check the Vertex AI region availability docs for the latest list.
Q: How does Gemini 3 Pro pricing compare on a real workload?
A: Headline price is $1.25 / $10.00 per million tokens up to 200K context. With 75% prompt cache discount and 50% Batch API discount, realized blended cost on long-running agent workloads typically lands at $0.80-$1.20 per million tokens.
Q: Can I use Antigravity with Claude or GPT-5.5?
A: Yes. Antigravity is unusually open — Claude Opus 4.7, GPT-5.5, and Gemini 3 Pro are all first-class providers in the IDE settings.
Q: What is the difference between A2A and MCP?
A: MCP is the agent-to-tool protocol; A2A is the agent-to-agent protocol. They are complementary, not competitive — most production agent stacks will use both.
Last reviewed 2026-05-05. Pricing and benchmarks change frequently — check primary sources before relying on numbers in this article.
Written by
Sagar Shankaran· Founder, CallSphere
Sagar Shankaran is the founder of CallSphere, where he builds production AI voice and chat agents deployed across healthcare, hospitality, real estate, and home services. He writes about agentic AI, LLM engineering, and shipping voice agents that handle real calls in production.
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