Benchmark
A multi-domain benchmark of about 2,500 graduate-level questions across subjects like chemistry, economics and literature, testing AI reasoning limits.
DeepSeek V4.1 Flash costs $2.10 off-peak for an agent run that costs $75 on Claude Opus 5, about 36x less, according to a dev.to analysis. Paying peak-hour rates halves that gap to about 18x, and running at max effort cuts it to about 15x.
Reality
Seven chain-of-thought monitors in a LessWrong study flagged 66 points fewer flawed physics solutions when their 'known correct' answer was wrong. Any pipeline that hands its monitor a reference answer depends on that reference being right.
Reality
Harness v0.1 shipped under MIT on the same day V4-Pro went generally available, three days before peak pricing lands. The lock-in it targets is the runtime, not the weights.
Perspective Coverage
4 publishersReality
Broken answer keys and graders that punish correct tool calls drove the verdicts. Epoch AI says it stops each review once it has enough evidence, so the published defect counts are floors.
Reality
Flash's off-peak input price is under a quarter of what V4-Pro cost, and on DeepSeek's own table it beats the old Pro checkpoint on Terminal-Bench, but it scores 36.8 on Humanity's Last Exam and no V4.1-Pro has a date.
Reality
The vendor selling the cheapest model in the comparison reports a 0.7-point quality spread across four frontier models against run-to-run variation of 1.4 to 3.2 points. That leaves price per task, $0.43 against an implied $6.45 for GPT-6 Astra.
Reality
A new evaluation gives models explicit rules about what may appear in their reasoning and scores whether they comply while still solving the problem. Compliance rose with model size and fell with more RL training.
Reality
The V4.1-Flash change log puts Terminal Bench 2.1 at 90.6 against V4-Pro's 87.9 and DeepSWE at 74.2 against 62.7. DeepSeek says API prices came down with the release and points to a pricing page for the amounts.
Reality
The 35-billion-parameter Iris-mini and the 397-billion-parameter Iris-pro build on Qwen models and run at 256,000 tokens of context. AllSpark also published the training recipe and scored every benchmark twice, once with context management switched off.
Reality
Artificial Analysis scores GLM-5.3-Flash 42 at $0.25 a task and Kimi K3 44 at $2.00 a task. At eight-to-one on price, a two-point composite gap settles nothing, and the cost of an hour of human review decides it.
Reality
Eleven tasks with pre-computed answer keys, three runs each, seven effort settings. Everything from low upward scored 33 of 33, so the only thing the top rung buys is the number on the launch page.
Reality
The same model produced 99.9% in OpenAI's launch post and 62.7% on the benchmark authors' neutral harness, and Astra's input tokens cost double GPT-5.6 Sol's, which leaves the vendor table doing very little work in a purchase decision.
Perspective Coverage
3 publishersReality
The MIT-licensed 320B model card claims it beats GLM-5.2 at a tenth of the price and approaches Claude Opus 4.8 on coding, but it names no dollar rate, and the comparisons are largely the vendor's own.
Reality
ARC Prize put GPT-6 Astra at 62.7% against OpenAI's 99.9%, and the third-party composite index has it 0.3 points above the model it replaces, which leaves the 20% safety compute overhead as the clearest number in the launch.
Reality
Artificial Analysis priced the new model at $10 and $50 per million tokens, and the threefold token cut it measured in the Codex agent harness covers that increase where the roughly 10% cut on its intelligence suite does not.
Reality
A developer graded 18 expired AI predictions against their own words. The best mark he shows is a C+, and the one he built on took six weeks out of his own roadmap.
Reality
Z.ai says every gain over GLM-5.2 came from post-training on broader production workflows. Whether that transfers to your stack is not something its private benchmark can tell you.
Perspective Coverage
3 publishersReality
A viral X post said an inference-time text layer put DeepSeek V4 Pro ahead of Fable 5 on every task. The report it points to shows single runs, nine benchmarks, and two losses.
Reality
The Ultrafast preview runs GPT-5.6 Sol on Cerebras hardware for a hand-picked customer list. That makes capacity allocation, not model choice, the constraint your architecture has to survive.
Perspective Coverage
3 publishersReality
OpenAI's invite-only Ultrafast tier runs the same GPT-5.6 Sol up to 14 times quicker, while Google halves Gemini Flash pricing until December 31. Latency is now its own budget line.
Perspective Coverage
3 publishersReality