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Head-to-head comparison

Claude Haiku 4.5 vs DeepSeek V3.1 Terminus

Claude Haiku 4.5 (Anthropic) and DeepSeek V3.1 Terminus (DeepSeek) compared on the ModelCap Index, API price, context window, provider availability, weight access and every public benchmark board they share. Figures are the same ones shown on the live rankings; nothing here is a hidden score.

Snapshot as of 10 September 2026

As of 10 September 2026, Claude Haiku 4.5 holds the stronger ModelCap Index position (#63 vs #66); DeepSeek V3.1 Terminus is 5× cheaper per output token ($1.00/1M vs $5.00/1M); Claude Haiku 4.5 offers the longer context window (200K vs 164K tokens); and DeepSeek V3.1 Terminus ships open weights.

Which should you choose?

Choose Claude Haiku 4.5 if…

  • you want the stronger overall ModelCap Index position — #63 against #66 (55.3 vs 54.1 points).
  • you need the longer context window — 200K tokens against 164K.
  • Arena coding is your yardstick — 1481 against 1461.
  • you want the more recently listed model — Claude Haiku 4.5 was listed 15 October 2025, DeepSeek V3.1 Terminus 22 September 2025.

Choose DeepSeek V3.1 Terminus if…

  • API cost matters — $1.00/1M output tokens against $5.00/1M, about 5× cheaper.
  • your workload is prompt-heavy — input tokens cost $0.27/1M against $1.00/1M.
  • you want to self-host: DeepSeek V3.1 Terminus ships open weights while Claude Haiku 4.5 is api only.

Claude Haiku 4.5 vs DeepSeek V3.1 Terminus: specs, pricing and context

Specification comparison of Claude Haiku 4.5 and DeepSeek V3.1 Terminus
FieldClaude Haiku 4.5AnthropicDeepSeek V3.1 TerminusDeepSeek
ModelCap Index position#63#66
Index score55.354.1
EvidenceMeasuredMeasured
Input price / 1M tokens$1.00$0.27
Output price / 1M tokens$5.00$1.00
Context window200K tokens164K tokens
Max output tokens64K33K
API providers listed44
Weight accessAPI onlyOpen weights
Input modalitiesText, Image, FileText
First listed15 October 202522 September 2025
PublisherAnthropicDeepSeek

Evidence: 3 public benchmark observations across 3 boards · 3 public benchmark observations across 3 boards. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: Claude Haiku 4.5 vs DeepSeek V3.1 Terminus

Public benchmark boards where Claude Haiku 4.5 or DeepSeek V3.1 Terminus has a published result
BoardClaude Haiku 4.5DeepSeek V3.1 TerminusLeads
Arena codingArena (LMArena)14811476–148514611438–1485ThinkingClaude Haiku 4.5
ARC-AGI-2ARC Prize Foundation4.0%Thinking—Only one result
SWE-benchSWE-bench (Princeton / SWE-agent team)66.6%High—Only one result
BFCL V4UC Berkeley (Gorilla)68.7Function calling—Only one result
AA Intelligence IndexArtificial Analysis—15.4intelligence-index:v4.3:reasoning-unspecifiedOnly one result
AA Terminal-Bench 2.1Artificial Analysis—44.9%terminal-bench:2.1:terminus-2:e2b:pass-at-1:3-repeats:source-model="DeepSeek V3.1 Terminus":reasoning=trueOnly one result
AA τ²-Bench TelecomArtificial Analysis—37.1%tau2:telecom:dual-control:pass-at-1:3-repeats:source-model="DeepSeek V3.1 Terminus (Non-reasoning)":reasoning=falseOnly one result
AA Humanity's Last ExamArtificial Analysis—8.7%hle:may-2025:text-only-2158:no-tools:pass-at-1:source-model="DeepSeek V3.1 Terminus (Non-reasoning)":reasoning=falseOnly one result

Scores are the sources' own published figures for each model's best evaluated configuration; ModelCap never re-runs a benchmark.

Want a different pairing? Open the interactive comparison tool to swap either model for any current ranked language model.

Claude Haiku 4.5 vs DeepSeek V3.1 Terminus: common questions

Is Claude Haiku 4.5 better than DeepSeek V3.1 Terminus?

Claude Haiku 4.5 ranks higher on the ModelCap Index as of 10 September 2026: #63 against #66. That is a capability ranking built from public benchmark evidence with published uncertainty; whether it is "better" for you also depends on price, context and where you can run it. Their published uncertainty intervals overlap, so the rank difference alone does not establish a reliable capability advantage for your workload.

Is Claude Haiku 4.5 cheaper than DeepSeek V3.1 Terminus?

DeepSeek V3.1 Terminus is cheaper on output tokens: $1.00/1M against $5.00/1M. Input tokens are $1.00/1M for Claude Haiku 4.5 and $0.27/1M for DeepSeek V3.1 Terminus. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens. For 1,000 requests with 2,000 input and 500 output tokens each (2M input + 0.5M output), the listed-rate estimate is $4.50 for Claude Haiku 4.5 versus $1.04 for DeepSeek V3.1 Terminus. DeepSeek V3.1 Terminus costs 76.9% less in this scenario. This excludes caching, batch discounts, prompt-length tiers, tool charges and retries; verify the selected endpoint before budgeting.

Which has the bigger context window, Claude Haiku 4.5 or DeepSeek V3.1 Terminus?

Claude Haiku 4.5 has the larger context window: 200K tokens against 164K.

Which is better for coding, Claude Haiku 4.5 or DeepSeek V3.1 Terminus?

Arena coding: Claude Haiku 4.5 1481, DeepSeek V3.1 Terminus 1461 — Claude Haiku 4.5 leads.

Are Claude Haiku 4.5 and DeepSeek V3.1 Terminus open-weight models?

Claude Haiku 4.5: API only. DeepSeek V3.1 Terminus: Open weights. Open weights mean the checkpoint can be downloaded and self-hosted under its licence; API-only models are available solely through hosted endpoints.

Where can I run Claude Haiku 4.5 and DeepSeek V3.1 Terminus?

ModelCap currently lists 4 API providers for Claude Haiku 4.5 and 4 for DeepSeek V3.1 Terminus, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this Claude Haiku 4.5 vs DeepSeek V3.1 Terminus comparison?

Every figure comes from the sealed ModelCap dataset published 10 September 2026; the page re-renders within a minute of each data refresh, and the ModelCap Index positions are the same ones shown on the live rankings.

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