Tutorials, deep dives and product notes — built for developers.
OpenAI shipped GPT-6 Sol 90 minutes after Claude Opus 5.5, at half the token price. Artificial Analysis ran both on the same tests: Sol is cheaper to any index score up to about 44, then runs out of headroom. Every benchmark, both effort ladders and the real bill.
Opus 5.5 matches GPT-6 Astra on Terminal-Bench 4.0 for roughly 40% of the cost per task, with 5x cheaper cache reads. Astra keeps uncontested leads in science, maths and gated offensive security — and OpenAI says it is harder to monitor.
Sixty days apart: a 29.7-point jump on scientific research, a 200,000-line codebase audit that drops from 20+ hours to under 3, and a 40% cost cut — plus four API changes that will 400 your Opus 5 integration.
Opus 5.5 wins eight of the nine benchmarks Anthropic publishes against Fable 5.1 at 2.5x lower token price - but four of those margins sit inside the disclosed error bars. Includes the HAProxy same-task test, the 16-0 research-report result and the one-way thinking-block handoff.
Anthropic's Claude Opus 5.5 matches Fable 5.1 on most work at $4/$20 per million tokens: 66.4% on Terminal-Bench 4.0, 1,846 GDPval-AA Elo, and 40% lower cost per task than Opus 5. Full benchmark table with footnotes, real tester results, the four breaking API changes, and where GPT-6 Astra still wins.
DeepSeek V4.1 Flash wins 5 of the 15 benchmarks it shares with Claude Opus 5 — by an average of 1.94 points, while undercutting it by up to 41.7× on output price. Opus 5's 10 wins average 10.19 points. Full vendor data, community test reports, pricing math, charts and a routing verdict.
Interactive Terminal-Bench 4.0 Leaderboard: GPT-6 Astra leads at 58.2% and Claude Fable 5.1 at 57.9%, with GLM-5.3 top open-weight at 41.8%. Complete scores, run costs, token counts, and verification links across 66 hard terminal tasks.
GPT-6 Astra review: every benchmark, what people built, pricing, and the Critical cybersecurity rollout — with sources.
Gemini 3.8 Flash review: DeepSWE v1.1 (73.7%), Terminal-Bench 2.1 (89.4%), full benchmark comparison vs Claude Opus 5 & GPT-5.6 Sol, real Antigravity builds with live links, and 3.8 Flash Cyber breakdown.
Comprehensive comparison of GLM 5.3 vs Claude Opus 5 with interactive radar capability chart, direct score bars, token pricing, and benchmark analysis. Updated August 19, 2026.
Interactive Terminal-Bench 3.0 leaderboard with Claude Opus 5 at 42.7%, GPT-5.6 Sol at 34.6%, GLM 5.3 at 28.3%, and all tracked frontier agent models ranked. Updated August 2026.
A data-backed comparison of Grok 4.6 and Claude Opus 5 across benchmarks, pricing, speed, latency, and context window — the intelligence king vs. the efficiency king.