Recommendations · open-entity · rec-backend-language-01

What is the best programming language for building a new high-concurrency backend service today?

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Divergence

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Avg stability

Refusal rate

Models

Where each model stands

ChatGPTGo×100%

ClaudeGo×100%

GeminiGo×100%

ChatGPT modal Go [Go, Go, Go, Go, Go] · stability 1.00

1 Go 0.90 The answer explicitly calls Go the “pragmatic default” and says: “If you want the best pragmatic balance for high concurrency, short time to market, and easy operations: choose Go.”
2 Go 0.93 The answer explicitly says: 'for most new high‑concurrency services today Go is often the best pragmatic choice' and concludes: 'If you want one single recommendation: start with Go for most new high‑concurrency backends.'
3 Go 0.95 The answer repeatedly recommends Go as the pragmatic first choice and states: "Pick Go for most new high‑concurrency backends. It’s simple, fast enough for most workloads, scales, and integrates well with modern cloud-native tooling."
4 Go 0.95 The answer's pragmatic default and single recommendation: “Pick Go — it offers excellent developer productivity...”; and: “If you want a single recommendation for most teams: start with Go. It hits the best balance of concurrency ergonomics, performance, ecosystem, and developer productivity.”
5 Go 0.95 The answer's concise recommendation: “start with Go for most high-concurrency backends today” and earlier: “the pragmatic default today is Go (golang) because it balances simple concurrency, good performance…”.

Claude modal Go [Go, Go, Go, Go, Go] · stability 1.00

1 Go 0.75 The answer states 'If you value simplicity + performance: Go' as its practical recommendation, positioning Go as the best choice for the most common scenario in high-concurrency backend development.
2 Go 0.95 The assistant explicitly states 'Choose Go unless you have a specific reason not to' and calls it the 'pragmatic choice' and 'productivity sweet spot for most teams' for high-concurrency backends, citing its excellent concurrency primitives, deployment simplicity, and speed.
3 Go 0.85 The answer explicitly states 'Start with Go' as the practical recommendation 'if you want productivity + performance balance' and describes it as 'often the pragmatic choice' for high-concurrency backends.
4 Go 0.95 Go is the most pragmatic default for a greenfield high-concurrency service—it hits a sweet spot of simplicity, performance, and productivity.
5 Go 0.92 Go is identified as the 'strongest general choice' and described as 'the sweet spot of simplicity + performance + fast iteration' for building high-concurrency backends. The answer states goroutines make concurrent code intuitive and cheap, with excellent tooling and deployment story.

Gemini modal Go [Go, Go, Go, no position, Go] · stability 1.00

1 Go 0.90 The answer names Go as '#1 The Default Choice for Most Teams' and concludes with the summary verdict: 'If you are unsure, pick Go.'
2 Go 0.85 In the short recommendation, the assistant advises: 'If you are starting a new startup or modern engineering project without specialized constraints: Default to Go.'
3 Go 0.95 The assistant names Go 'The Default Pragmatic Choice' and concludes in the rule of thumb that 'Go is currently the best baseline choice for a new high-concurrency backend service.'
4 no position 0.90 The answer states 'There is no single "best" language' and presents four different options (Go, Rust, Elixir, Java) depending on specific workload requirements and team needs.
5 Go 0.95 The assistant calls Go 'the pragmatic industry standard' and states in the conclusion that 'For 80% of new projects, Go is the safest, most cost-effective, and highly scalable choice today.'

Change over time

No change from the prior run — every model's modal stance held.

Every stance label is a derived judgment over the model's free-text answer, kept auditable against the original transcript in the run's raw data. Method: /methodology.